Question

The major product for the following reaction is:

A.
B.
C.
D.

Answer 1

We have to remember that when alc. KOH is reacted with alkyl halide the HX is removed from the compound leads to the formation of alkene. In case of free radical polymerization the polymer is formed by the successive addition of free radical species.

Complete answer:
Let’s start with discussing a little about the reaction of halide compounds with alc. KOH and the free radical polymerization. When a halide compound reacts with alc. KOH the molecule produces alkenes as the –OH acts as a base and not as a nucleophile. When alc. KOH is reacted with alkyl halide the HX is removed from the compound leads to the formation of alkene. In case of free radical polymerization the polymer is formed by the successive addition of free radical species.
Coming to the question, we are provided with an alkyl halide so clearly when it reacts with alc. KOH the first thing that will happen is the alkyl halide will convert to alkene. The structure of alkene form is given below:
After the formation of this alkene the double bond will break which leads to the formation of free radical and many such units combine together leading to the free radical polymerization. The polymer formed is as follows:

Hence the answer to this question is option A.

Note:
We have to remember that the –OH group in KOH is used as base and nucleophile in reactions with alkyl halide. But its use as a nucleophile or base is restricted by the conditions. –OH acts as a nucleophile when KOH is present in aqueous solution which is generally written as aq. KOH. And –OH acts as a phase when alcoholic KOH is being used.