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(A) The conversion of ethylbenzene to $p$-bromostyrene involves three steps:$1$. Electrophilic aromatic substitution: Treatment of ethylbenzene with $

Vedclass · Accepted Answer

$Br_2 / Fe ; Cl_2, \Delta ; 	ext{alc. } KOH$

Vedclass · Answer

(A) The conversion of ethylbenzene to $p$-bromostyrene involves three steps:$1$. Electrophilic aromatic substitution: Treatment of ethylbenzene with $Br_2 / Fe$ (or $FeBr_3$) leads to bromination at the para position due to the ortho/para-directing nature of the ethyl group.$2$. Free radical halogenation: Treatment with $Cl_2, \Delta$ (or $h
u$) results in the chlorination of the benzylic position of the ethyl group.$3$. Dehydrohalogenation: Treatment with alcoholic $KOH$ (alc. $KOH$) causes the elimination of $HCl$ from the side chain to form the vinyl group (styrene derivative).Thus,the correct sequence is $Br_2 / Fe ; Cl_2, \Delta ; 	ext{alc. } KOH$.

Choose the correct set of reagents for the following conversion.

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