2,3-dimethylbut-2-ene when reacted with bromi | vedclass

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Question

(B) The reaction of $2,3$-dimethylbut-$2$-ene with bromine $(Br_2)$ in $CCl_4$ is an electrophilic addition reaction,which yields $2,3$-dibromo-$2,3$-

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Vedclass · Answer

(B) The reaction of $2,3$-dimethylbut-$2$-ene with bromine $(Br_2)$ in $CCl_4$ is an electrophilic addition reaction,which yields $2,3$-dibromo-$2,3$-dimethylbutane.$CH_3-C(CH_3)=C(CH_3)-CH_3 + Br_2 ightarrow CH_3-C(CH_3)(Br)-C(CH_3)(Br)-CH_3$When $2,3$-dibromo-$2,3$-dimethylbutane is heated with alcoholic $KOH$,it undergoes a dehydrohalogenation reaction (elimination of two molecules of $HBr$) to form the conjugated diene,$2,3$-dimethylbuta-$1,3$-diene.$CH_3-C(CH_3)(Br)-C(CH_3)(Br)-CH_3 \xrightarrow{	ext{alc. } KOH, \Delta} CH_2=C(CH_3)-C(CH_3)=CH_2 + 2HBr$Thus,the major product is $2,3$-dimethylbuta-$1,3$-diene.

$2,3$-dimethylbut-$2$-ene when reacted with bromine forms a compound which upon heating with alcoholic $KOH$ produces the following major product.

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