Identify the major product A in the following | vedclass

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(B) $1$. The reaction of but$-2-$ene with $Br_2$ in $CCl_4$ results in the formation of $2,3-dibromobutane$ $(CH_3-CH(Br)-CH(Br)-CH_3)$.$2$. Treatment

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$CH_3 - C \equiv C - CH_3$

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(B) $1$. The reaction of but$-2-$ene with $Br_2$ in $CCl_4$ results in the formation of $2,3-dibromobutane$ $(CH_3-CH(Br)-CH(Br)-CH_3)$.$2$. Treatment with $alc. KOH$ causes dehydrohalogenation,removing one molecule of $HBr$ to form $2-bromobut-2-ene$ $(CH_3-C(Br)=CH-CH_3)$.$3$. Further treatment with a strong base like $NaNH_2$ removes the second molecule of $HBr$ to form the alkyne,$but-2-yne$ $(CH_3-C \equiv C-CH_3)$.

Identify the major product $A$ in the following reaction sequence:
$CH_3-CH=CH-CH_3$ $\xrightarrow[CCl_4]{Br_2}$ $\xrightarrow[(ii) NaNH_2]{(i) alc. KOH} (A)$

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Identify the major product $A$ in the following reaction sequence:$CH_3-CH=CH-CH_3$ $\xrightarrow[CCl_4]{Br_2}$ $\xrightarrow[(ii) NaNH_2]{(i) alc. KOH} (A)$