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Nomenclature of Carbonyls

Which of the ...

Question

Which of the following possess acidic hydrogen :

A

C_{2} H_{6}

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B

C_{2} H_{4}

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C

C_{2} H_{2}

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D

C H_{4}

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Solution

The correct option is C $C_{2} H_{2}$
Only alkyne has acidic hydrogen.

As we move from alkane to alkyne, hybridisation of carbon changes from $s p^{3}$ to $s p$ means s character of orbital increases and as s character increases hydrogen becomes more acidic.

$∴ H C \equiv C H$ ( $C_{2} H_{2}$ ) has acidic hydrogen.

Option C is correct.

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