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Question

Chemistry Question on Methods of Preparation of Haloalkanes

Chlorination of which of the following substance is a substitution reaction?

A

2-butene

B

1-butyne

C

iso-butane

D

iso-butylene

Answer

iso-butane

Explanation

Solution

Unsaturated compounds like alkenes, alkynes show addition reaction with chlorine while saturated compounds like alkane (iso-butane) give substitution reaction on chlorination.
CH3−CHC∣H3−CH3iso - butane−>[Cl2][light]CH3−CH−CH2Cl+CH3−CC∣lC∣H3−CH3\underset{\text{iso - butane}}{CH _{3}- \underset{\overset{|}{C}H_3}{CH} - CH _{3}} {->[{ Cl _{2}}][\text{light}]} CH _{3}- CH - CH _{2} Cl+ CH _{3}- \underset{\overset{|}{C}H_3}{\overset{\underset{|}{C}l}{C}} - CH _{3}