Towards catalytic hydrogenation, the least reactive compound is:

{C H}_{2} = {C H}_{2}

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{C H}_{3} - C H = {C H}_{2}

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H_{3} C - C H = C H - {C H}_{3}

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({C H}_{3})_{2} C = C {(C H}_{3})_{2}

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Solution

The correct option is A ${C H}_{2} = {C H}_{2}$
As the number of $α$ -hydrogen involved reactivity towards catalytic hydrogenation increases. ${C H}_{2} = {C H}_{2}$ have zero $α$ -hydrogen. So, it is least reactive towards catalytic hydrogenation.
hence A is correct option.

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