Which of the following reacts with metal by displacing the hydrogen atom?

C H_{4}

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C_{2} H_{6}

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C_{2} H_{4}

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C_{2} H_{2}

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Solution

The correct option is B $C_{2} H_{2}$
Hydrogen bonded to triple bonded carbon is acidic in nature and is being replaced by metal.
$H C \equiv C - H + N a \to H C \equiv C^{-} N a^{+} + \frac{1}{2} H_{2}$

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