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Acetylenic hydrogens are acidic because

1. Sigma electron density of C−H bond in acetylene is nearer to carbon, which has 50% s-character
2. Acetylene has only open hydrogen in each carbon
3. Acetylene contains least number of hydrogens among the possible hydrocarbons having two carbons
4. Acetylene belongs to the class of alkynes with molecular formula, CnH2n−2

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

Solution

Acetylenic hydrogens are acidic because the sp-hybridized carbon in acetylene has 50% s-character, which increases the electronegativity of carbon, pulling the sigma electron density closer and making the hydrogen more acidic.

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