Acetylenic hydrogens are acidic because

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Sigma electron density of C – H bond in acetylene is nearer to carbon, which has 50% s- character

Acetylene has only one hydrogen on each carbon

Acetylene contains least number of hydrogens among the possible hydrocarbons having two carbons

Acetylene belongs to the class of alkynes with molecular formula, \ $m a t h r m C_{n} H_{2 n - 2}$ .

answer is A.

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Detailed Solution

Given data: It is given to identify the acetylenic hydrogens are acidic because. Explanation:

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Acetylene's C-H bond is formed by a sp-hybridised carbon atom. Because s-electrons are closer to the nucleus than p electrons, electrons in a bond with a higher s-character will be closer to the nucleus. The electrons constituting this bond are more strongly bonded by the carbon nucleus in alkynes whose character is 50%. As a result, the acetylenic C-atom becomes more electronegative in comparison to sp² and sp³, and the hydrogen atom on the carbon atom ( C - H) can be easily removed.

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