Q. Which one of the following compounds on dehalogenation gives 2, 3-dimethyl-but-2-ene?

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$CH_{3}-\left(\right.CH_{2}\left(\left.\right)_{4}-CHCl_{2}$

$CH_{3}-CH_{2}-CHCl_{2}$

$CH_{2}Cl-\left(\right.CH_{2}\left(\left.\right)_{4}-CH_{2}Cl$

Solution:

on dehalogenation gives 2, 3-dimethyl-but-2-ene as follows

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