$C H_{3} - C B r_{2} - C B r_{2} C H_{3} + 2 Z n \to$

C H_{3} - C \equiv C - C H_{3}

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C H_{3} - C \equiv C - C H_{2} B r

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C H_{3} - C B r \equiv C - C H_{3}

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C H_{2} - C \equiv C - C H_{3}

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Solution

The correct option is A $C H_{3} - C \equiv C - C H_{3}$
$C H_{3} - C B r_{2} - C B r_{2} - C H_{3} + 2 Z n \to C H_{3} - C \equiv C - C H_{3} + 2 Z n B r_{2}$
The above reaction is dehalogenation of vic-Tetrahalogen Compounds. Vicinal tetrahaloalkanes can be dehalogenated with zinc metal in an organometallic reaction to form alkynes. This reaction has the drawback that the halogen compound is itself prepared by halogen addition to alkynes.

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