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

KVPYKVPY 2013

Solution:

$2,3$ dimethylbut-$2$-ene when reacts with bromine forms $2,3$ dibromo $2,3$ dimethyl butane which upon heating with alcoholic $KOH$ produces $2,3$ dimethylbut- $1,3$ -diene as a major product. The reaction can be written as

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