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question_answer1) In cracking, C-C bonds cleave in preference to C-H bonds. Explain.
question_answer2) Branched chain alkanes have less boiling points as compared to straight chain isomers. Discuss.
question_answer3) An oxidising agent is needed in the iodination of methane but not in the chlorination or bromination. Assign reason.
question_answer4) Reaction with bromine dissolved in \[CC{{l}_{4}}\] or bromine water is used as a test for unsaturation both for alkenes and alkynes. Why?
question_answer5) When methane is chlorinated, the products formed also contains traces of chloroethane. How will you account for it?
question_answer6) Iodine does not react with ethane though \[{{I}_{2}}\] is more easily cleaved homolytically than the other halogens. Explain.
question_answer7) An alkane with molecular formula \[{{C}_{7}}{{H}_{16}}\] forms four monochloro products when heated with chlorine in the presence of ultra violet radiations. Give the structure of the alkane and also of the products. Write their IUPAC names as well.
question_answer8) Alkynes do not undergo ozonolysis like alkenes. Why?
question_answer9) Write all the isomeric cyclic structures for the molecular formula \[{{C}_{7}}{{H}_{8}}\].
question_answer10) The dipole moment of trans 1, 2-dichloroethene is less than the cis isomer. Discuss.
question_answer11) An alkene has molecular mass 70. Write all the possible structural isomers and give their IUPAC names.
question_answer12) Identify and justify the correct order of reactivity in electrophilic substitution in the following compounds:
question_answer13) Out of but-1-yne and but-1-ene, which has more dipole moment?
question_answer14) Give reasons for the following: (i) tert-butyl benzene does not give benzoic acid on treatment with acidic \[KMn{{O}_{4}}\] (ii)\[C{{H}_{2}}=\overline{C}H\] is more basic than \[HC\equiv \overline{C}\]
question_answer15) Why does not aniline take part in the Friedel Craft reaction?
question_answer16) Unsaturated compounds undergo addition reactions. Explain.
question_answer17) But-1-yne is weakly acidic but but-2-yne is not. Assign reason.
question_answer18) Write the structural formulae of all the possible isomers of \[{{C}_{2}}{{H}_{2}}C{{l}_{2}}\]. Indicate which one of them is non-polar?
question_answer19) Which of the following has the highest boiling point? (i) 2-methylpentane (ii) 2, 3-dimethylbutane (iii) 2, 2-dimethylbutane.
question_answer20) What effect the branching of an alkane has on its melting point?
question_answer21) An organic compound \[{{C}_{8}}{{H}_{18}}\] on mono chlorination gives a single mono chloride. Write the structure of the hydrocarbon.
question_answer22) What are the main constituents of LPG?
question_answer23) Why do the C?C bonds rather than C?H bonds break during cracking of alkanes?
question_answer24) Is it possible to isolate pure staggered ethane or pure eclipsed ethane at room temperature? Explain.
question_answer25) trans-Pent-2-ene is polar while trans- but-2-ene is non-polar. Explain.
question_answer26) Identify the organic products obtained in the following reaction:
question_answer27) Complete the following reactions with appropriate structures of products? \[{{C}_{6}}{{H}_{5}}CH=C{{H}_{2}}\xrightarrow{B{{r}_{2}}}\]\[[A]\,\xrightarrow[\text{(ii)}\,\text{C}{{\text{H}}_{\text{3}}}\text{I}]{\text{(i)NaN}{{\text{H}}_{\text{2}}}\text{(3}\text{.0}\,\text{equiv}\text{.)}}B\]
question_answer28) How will you prepare 3-methylbut-1-yne by starting with ethyne?
question_answer29) Why HF forms H-bonding with ethyne even though it is non-polar in nature?
question_answer30) Ethyne reacts with dil. \[{{H}_{2}}S{{O}_{4}}\] in presence of mercury salts to give acetaldehyde but with dil. \[HCl\] under similar conditions, it gives vinyl chloride. Explain why?
question_answer31) How will you prepare (i) cis-pent-2-ene and trans-pent-2-ene by starting with ethyne?
question_answer32) Starting with ethyne, how will you prepare pentan-2-one?
question_answer33) How will you separate a mixture of ethane, ethylene and acetylene?
question_answer34) A conjugated alkadiene having molecular formula \[{{C}_{13}}{{H}_{22}}\] on ozonolysis yielded ethyl methyl ketone and cyclohexanecarbaldehyde. Identify the diene, write its structural formula and give its IUPAC name.
question_answer35) Predict which of the following systems would be aromatic and why? (i) (ii) (iii) (iv)
question_answer36) Write the major product in each case (a) (b)\[C{{H}_{3}}-C\equiv C-C{{H}_{3}}\xrightarrow{\text{Na/liq}\,\text{N}{{\text{H}}_{\text{3}}}}\]
question_answer37) Write the ozonolysis products of mesitylene.
question_answer38) Predict the products of the following reactions (i) (ii)
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