Which of the following alkane cannot be prepared by Wurtz reaction?

{C H}_{4}

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C_{2} H_{6}

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C_{4} H_{10}

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C_{6} H_{12}

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Solution

The correct option is A ${C H}_{4}$
Wurtz reaction forms coupled products only.

The Wurtz reaction is: $2 R - X + 2 N a \to R - R + 2 N a^{+} X^{-}$

$C H_{4}$ contains only one carbon, so it cannot be formed by Wurtz reaction.

So, option ( A ) is correct.

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