12th Class Chemistry Haloalkanes and Haloarenes / हैलोएल्केन तथा हैलोएरीन्स Question Bank

done Assertion And Reason (MCQs) - Haloalkanes and Haloarenes Total Questions - 15

• question_answer1)

  Directions : (1 - 15)

  For question numbers 1-15, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

  Assertion: p-Dichlorobenzene is less soluble in organic solvents than the corresponding o-isomer.

  Reason: o-Dichlorobenzene is polar while p-dichlorobenzene is not.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer2)

  Assertion: Boiling point of alkyl halides increases with increase in molecular weight.

  Reason: Boiling point of alkyl halides is in the order\[RI\text{ }>\text{ }RBr\text{ }>\text{ }RCI\text{ }>RF\].

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer3)

  Assertion: Tertiary haloalkanes are more reactive than primary haloalkanes towards elimination reactions.

  Reason: The +I effect of the alkyl groups weakens the C - X bond.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer4)

  Assertion: Vinylic halides are highly reactive towards nucleophilic substitution reactions.

  Reason: Reactivity is due to the polarity of carbon-halogen bond.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer5)

  Assertion: The presence of nitro group facilitates nucleophilic substitution reactions in aryl halides.

  Reason: The intermediate carbanion is stabilised due to the presence of nitro group.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer6)

  Assertion: Lower members of alkyl halides are colourless gases.

  Reason: Alkyl iodides in general turn black on exposure to air and light.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer7)

  Assertion: Boiling point of RCI is greater than RF.

  Reason: R-CI is more stable than R-F.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer8)

  Assertion: Bromobenzene upon reaction with \[B{{r}_{2}}/Fe\] gives 1, 4-dibromobenzene as the major product.

  Reason: In bromobenzene, the inductive effect of the bromo group is more dominant than the mesomeric effect in directing the incoming electrophile.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer9)

  Assertion: Electron withdrawing groups in aryl halides decrease the reactivity towards nucleophilic substitution.

  Reason: 2, 4-Dinitrochlorobenzene is more reactive than chlorobenzene.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer10)

  Assertion: Benzyl chloride is more reactive thanp-chlorotoluene towards aqueous NaOH.

  Reason: The C - Cl bond in benzyl chloride is more polar than C - Cl bond inp-chlorotoluene.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer11)

  Assertion: 2-Chloro-3-methylbutan on treatment with alcoholic potash give 2-methylbut-2-ene as major product.

  Reason: The reaction occurs according to Saytzeff rule.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer12)

  Assertion: Haloalkanes show H-bonding.

  Reason: Haloalkanes are insoluble in water.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer13)

  Assertion: Vinyl chloride is less reactive than alkyl chloride.

  Reason: Stability of alkyl halide decreases as the strength of C-X bond decreases.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer14)

  Assertion: Aryl halide gives a mixture of o-and p-products.

  Reason: Aryl halides undergo electrophilic substitutions more readily than benzene.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer15)

  Assertion: Carbon-halogen bond in aryl halide has partial double bond character.

  Reason: Aryl halides undergo nucleophilic substitution easily.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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