NEET Chemistry GOC Question Bank

done Assertion and Reason Total Questions - 22

• question_answer1)

  Assertion: Aniline is better nucleophile than an ilium ion.

  Reason: An ilium ion have +ve charge. [AIIMS 1996]

  Read the assertion and reason carefully to mark the correct option out of the options given below:

  A)
   If both assertion and reason are true and the reason is the correct explanation of the assertion. [a] It is fact that aniline is better nucleophile than anilium ion. Anilium ion contain +ve charge, which reduces the tendency to donate lone pair of electron\[\underset{\text{Anilium ion}}{\mathop{{{C}_{6}}{{H}_{5}}NH_{3}^{+}}}\,\]. Therefore, both assertion and reason are true. done clear
  B)
   If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
   If assertion is true but reason is false. done clear
  D)
   If the assertion and reason both are false. done clear
  E)
   If assertion is false but reason is true. done clear
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• question_answer2)

  Assertion: Neopentane forms one mono substituted compound.

  Reason: Neopentane is isomer of pentane.[AIIMS 2001]

  Read the assertion and reason carefully to mark the correct option out of the options given below:

  A)
   If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
  If both assertion and reason are true but reason is not the correct explanation of the assertion. [b] Neopentane is isomer of pentane and neopentane forms only one substitution product. Both assertion and reason are true but reason is not a correct explaination of assertion. Neopentane forms mono substituted product due to presence of four identical methyl groups present on carbon atom. done clear
  C)
   If assertion is true but reason is false. done clear
  D)
   If the assertion and reason both are false. done clear
  E)
   If assertion is false but reason is true. done clear
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• question_answer3)

  Assertion: Trans-2-butene on reaction with \[B{{r}_{2}}\] gives meso-2, 3-dibromobutane.

  Reason: The reaction involves syn-addition of bromine. [AIIMS 2003]

  Read the assertion and reason carefully to mark the correct option out of the options given below:

  A)
   If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
   If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
   If assertion is true but reason is false. [c] The assertion that trans-2 butene reacts with \[B{{r}_{2}}\] to product meso-2, 3-dibromobutane is correct but it does not involve syn-addition of \[B{{r}_{2}}\]. done clear
  D)
   If the assertion and reason both are false. done clear
  E)
   If assertion is false but reason is true. done clear
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• question_answer4)

  Assertion: Cis-1, 3-dihydroxy cyclohexane exists in boat conformation.

  Reason: In the chair form, there will not be hydrogen bonding between the two hydroxyl groups. [AIIMS 2003]

  Read the assertion and reason carefully to mark the correct option out of the options given below:

  A)
   If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
   If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
   If assertion is true but reason is false. done clear
  D)
   If the assertion and reason both are false. [d] Here both assertion and reason are incorrect because cis-1, 3-dihydroxy cyclohexane exist in chair conformation and in chair conformation hydrogen bonding is present. done clear
  E)
   If assertion is false but reason is true. done clear
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• question_answer5)

  Assertion: Hydroxyketones are not directly used in Grignard reaction.

  Reason: Grignard reagents react with hydroxyl group. [AIIMS 2003]

  Read the assertion and reason carefully to mark the correct option out of the options given below:

  A)
   If both assertion and reason are true and the reason is the correct explanation of the assertion. [a] Hydroxy ketones are not directly used in Grignard reagent. Grignard reagents are very reactive. Therefore, they react with hydroxyl group. Here both are correct. done clear
  B)
   If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
   If assertion is true but reason is false. done clear
  D)
   If the assertion and reason both are false. done clear
  E)
   If assertion is false but reason is true. done clear
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• question_answer6)

  Assertion: Benzyl bromide when kept in acetone water it produces benzyl alcohol.

  Reason: The reaction follows SN2 mechanism.[AIIMS 2003]

  Read the assertion and reason carefully to mark the correct option out of the options given below:

  A)
   If both assertion and reason are true and the reason is the correct explanation of the assertion. [a] The assertion that on keeping benzyl bromide in acetone water it produces benzyl alcohol is correct. Because \[{{C}_{6}}{{H}_{5}}C{{H}_{2}}Br\] hydrolysed to produce \[{{C}_{6}}{{H}_{5}}C{{H}_{2}}OH\]. This conversion is of \[S{{N}^{2}}\] mechanism. done clear
  B)
   If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
   If assertion is true but reason is false. done clear
  D)
   If the assertion and reason both are false. done clear
  E)
   If assertion is false but reason is true. done clear
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• question_answer7)

  Assertion: Carbon possesses property of catenation.

  Reason: Carbon atoms form double as well as triple bonds during catenation.

  Read the assertion and reason carefully to mark the correct option out of the options given below:

  A)
   If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
   If both assertion and reason are true but reason is not the correct explanation of the assertion. [b] Catenation property of carbon is primarily due to its small size. Electronic configuration and unique strength of carbon-carbon bonds. done clear
  C)
   If assertion is true but reason is false. done clear
  D)
   If the assertion and reason both are false. done clear
  E)
   If assertion is false but reason is true. done clear
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• question_answer8)

  Assertion: Olefins have the general formula\[{{C}_{n}}{{H}_{2n+1}}\].

  Reason: There is one double bond between two carbon atoms in their molecules.

  Read the assertion and reason carefully to mark the correct option out of the options given below:

  A)
   If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
   If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
   If assertion is true but reason is false. done clear
  D)
   If the assertion and reason both are false. done clear
  E)
   If assertion is false but reason is true. [e] Olefins are unsaturated hydrocarbons containing two hydrogen atoms less than the corresponding paraffin i.e. there is one double bond between two carbon atoms in their molecules and they have the general formula \[{{C}_{n}}{{H}_{2n}}\]. done clear
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• question_answer9)

  Assertion: Saturated hydrocarbons are chemically less reactive.

  Reason: All isomeric paraffins have same parent name.

  Read the assertion and reason carefully to mark the correct option out of the options given below:

  A)
   If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
   If both assertion and reason are true but reason is not the correct explanation of the assertion. [b] Less reactivity of saturated hydrocarbons are due to presence of single bonds between carbon atoms. done clear
  C)
   If assertion is true but reason is false. done clear
  D)
   If the assertion and reason both are false. done clear
  E)
   If assertion is false but reason is true. done clear
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• question_answer10)

  Assertion: A mixture of glucose and m-dinitrobenzene can be separated by shaking it with ether.

  Reason: Glucose is soluble in water.

  Read the assertion and reason carefully to mark the correct option out of the options given below:

  A)
   If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
   If both assertion and reason are true but reason is not the correct explanation of the assertion. [b] Glucose is insoluble in ether. done clear
  C)
   If assertion is true but reason is false. done clear
  D)
   If the assertion and reason both are false. done clear
  E)
   If assertion is false but reason is true. done clear
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• question_answer11)

  Assertion: Tertiary carbonium ions are generally formed more easily than primary carbonium ions.

  Reason: Hyperconjugative as well as inductive effect due to additional alkyl groups stabilize tertiary carbonium ions.

  Read the assertion and reason carefully to mark the correct option out of the options given below:

  A)
   If both assertion and reason are true and the reason is the correct explanation of the assertion. [a] An alkyl group attached to the positively charged carbon of a carbonium ion tends to release electrons towards that carbon; thus the positive charges gets dispersed as the alkyl group becomes somewhat positively charged itself. More the number of alkyl groups, the greater is the dispersal of positive charge and therefore more easily it will be formed. done clear
  B)
   If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
   If assertion is true but reason is false. done clear
  D)
   If the assertion and reason both are false. done clear
  E)
   If assertion is false but reason is true. done clear
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• question_answer12)

  Assertion: Heterolytic fission involves the breaking of a covalent bond in such a way that both the electrons of the shared pair are carried away by one of the atoms.

  Reason: Heterolytic fission occurs readily in polar covalent bonds.

  Read the assertion and reason carefully to mark the correct option out of the options given below:

  A)
   If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
   If both assertion and reason are true but reason is not the correct explanation of the assertion. [b] Heterolytic fission occurs when the two atoms differ considerably in their electronegativities and shared pair of electrons is carried by more electronegative atom. done clear
  C)
   If assertion is true but reason is false. done clear
  D)
   If the assertion and reason both are false. done clear
  E)
   If assertion is false but reason is true. done clear
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• question_answer13)

  Assertion: The order of reactivity of carbonium ions is \[2{}^\circ >3{}^\circ >1{}^\circ \].

  Reason: Carbon atom in carbonium ions is in \[s{{p}^{3}}\] state of hybridisation.

  Read the assertion and reason carefully to mark the correct option out of the options given below:

  A)
   If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
   If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
   If assertion is true but reason is false. done clear
  D)
   If the assertion and reason both are false. [d] The order of reactivity of carbonium ions is \[1{}^\circ >2{}^\circ >3{}^\circ \]. Carbon atom in carbonium ion is in \[s{{p}^{2}}\] state of hybridisation. The three hybridized orbitals lie in the same plane and are involved in the formation of three s bonds with three atoms or groups while the unhybridised p-orbital remains vacant. done clear
  E)
   If assertion is false but reason is true. done clear
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• question_answer14)

  Assertion: Free radicals are short lived and highly reactive.

  Reason: Free radicals are highly unstable.

  Read the assertion and reason carefully to mark the correct option out of the options given below:

  A)
   If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
   If both assertion and reason are true but reason is not the correct explanation of the assertion. [b] Since free radicals contain odd electrons, so they are short lived and they readily try to pair up the odd electrons to form neutral molecules, that is why they are highly reactive. done clear
  C)
   If assertion is true but reason is false. done clear
  D)
   If the assertion and reason both are false. done clear
  E)
   If assertion is false but reason is true. done clear
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• question_answer15)

  Assertion: Each carbon in ethylene molecule is \[s{{p}^{2}}\] hybridised.

  Reason: The \[H-C-H\] bond angle in ethylene molecule is 120°.

  Read the assertion and reason carefully to mark the correct option out of the options given below:

  A)
   If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
   If both assertion and reason are true but reason is not the correct explanation of the assertion. [b] Each carbon atom in ethylene is attached to two hydrogen atoms by single covalent bonds and to another carbon atoms by a double bond. Since each carbon is attached to three other atoms, it uses \[s{{p}^{2}}\] hybrid orbitals and an unhybridised \[{{p}_{Z}}\] orbital to form its bond. Each \[C-H\] bond is a \[\sigma \] bond resulting from the overlap of \[1s\] orbital of hydrogen atom and \[s{{p}^{2}}\] orbital of a carbon atom. One \[C-C\] bond results from the linear overlap of \[s{{p}^{2}}\] orbitals one from each carbon atom. One \[\pi \]bond results from the lateral overlap of two unhybridised \[{{p}_{Z}}\] orbitals, one from each carbon atom.        done clear
  C)
   If assertion is true but reason is false. done clear
  D)
   If the assertion and reason both are false. done clear
  E)
   If assertion is false but reason is true. done clear
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• question_answer16)

  Assertion: Cyclohexanone exhibits keto-enol tautomerism.

  Reason: In cyclohexanone, one form contains the keto group (C = O) while other contains enolic group \[(-C=C-OH)\].

  Read the assertion and reason carefully to mark the correct option out of the options given below:

  A)
   If both assertion and reason are true and the reason is the correct explanation of the assertion. [a] In cyclohexanone keto enol tautomerism is as follows             done clear
  B)
   If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
   If assertion is true but reason is false. done clear
  D)
   If the assertion and reason both are false. done clear
  E)
   If assertion is false but reason is true. done clear
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• question_answer17)

  Assertion: Staggered form is less stable than the eclipsed form.

  Reason: The conformation in which the bond pairs of two central atoms are very far from one another is called staggered form.

  Read the assertion and reason carefully to mark the correct option out of the options given below:

  A)
   If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
   If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
   If assertion is true but reason is false. done clear
  D)
   If the assertion and reason both are false. done clear
  E)
   If assertion is false but reason is true. [e] The staggered form is more stable than the eclipsed form because the potential energy of staggered form in which the bond pairs of two carbons are far away from each other is minimum. Also the H-atoms are as far apart as possible and non-bonded interaction between them is maximum. In occupied form, the H-atom are very close and so the increased overlap between them non-bonded orbitals is repulsive. That is why staggered form is more stable than eclipsed form. done clear
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• question_answer18)

  Assertion: Trans isomers are more stable than cis isomer.

  Reason: The cis isomer is the one in which two similar groups are on the same side of double bond.

  Read the assertion and reason carefully to mark the correct option out of the options given below:

  A)
   If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
   If both assertion and reason are true but reason is not the correct explanation of the assertion. [b] Trans isomer is more stable than cis isomer because in cis isomer, the bulky groups are on the same side of the double bond. The steric repulsion of the groups makes the cis isomer less stable than the trans isomer in which the bulky groups are far apart. (They are on the opposite side of the double bond). done clear
  C)
   If assertion is true but reason is false. done clear
  D)
   If the assertion and reason both are false. done clear
  E)
   If assertion is false but reason is true. done clear
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• question_answer19)

  Assertion: Propadiene is optically active.

  Reason: Propadiene has a plane of symmetry.

  Read the assertion and reason carefully to mark the correct option out of the options given below:

  A)
   If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
   If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
   If assertion is true but reason is false. done clear
  D)
   If the assertion and reason both are false. done clear
  E)
   If assertion is false but reason is true. [e] 1, 2-propadiene is not optically active because the terminal \[s{{p}^{2}}\]-hybridised carbons have the same atoms i.e. H-atoms. As a result, it has a plane of symmetry passing through the three carbon atoms and hence the molecule is optically inactive. done clear
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• question_answer20)

  Assertion: Lactic acid is optically active.

  Reason: A symmetry in the inner structure of the organic compound causes optical activity.

  Read the assertion and reason carefully to mark the correct option out of the options given below:

  A)
   If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
   If both assertion and reason are true but reason is not the correct explanation of the assertion. [b] Lactic acid is a chiral molecule because it has a chiral carbon atom or asymmetric carbon atom and is therefore optically active. done clear
  C)
   If assertion is true but reason is false. done clear
  D)
   If the assertion and reason both are false. done clear
  E)
   If assertion is false but reason is true. done clear
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• question_answer21)

  Assertion: Same number of electron pairs are present in resonance structures.

  Reason: Resonance structures differ in the location of electrons around the constituent atoms.

  Read the assertion and reason carefully to mark the correct option out of the options given below:

  A)
   If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
   If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
   If assertion is true but reason is false. done clear
  D)
   If the assertion and reason both are false. done clear
  E)
   If assertion is false but reason is true. [e] Resonance structures contain the same number of unpaired electrons. done clear
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• question_answer22)

  Assertion: Carbon-oxygen bonds are of equal length in carbonate ion.

  Reason: Bond length decreases with the multiplicity of bond between two atoms.

  Read the assertion and reason carefully to mark the correct option out of the options given below:

  A)
   If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
   If both assertion and reason are true but reason is not the correct explanation of the assertion. [b] \[CO_{3}^{2-}\] shows resonance and thus all the three bonds are of identical bond length.             \[O\underset{\,\,{{O}_{-}}}{\mathop{\underset{|}{\mathop{=C-}}\,}}\,{{O}^{-}}\leftrightarrow {{O}^{-}}\underset{\,{{O}_{-}}}{\mathop{\underset{|}{\mathop{-C=}}\,}}\,O\leftrightarrow {{O}^{-}}-\underset{O}{\mathop{\underset{||}{\mathop{C}}\,}}\,-{{O}^{-}}\] done clear
  C)
   If assertion is true but reason is false. done clear
  D)
   If the assertion and reason both are false. done clear
  E)
   If assertion is false but reason is true. done clear
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