Acetylenic hydrogens are acidic because

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(A) The formation of $C-H$ bond in acetylene involves $sp-$hybridised carbon atom.Since $s-$electrons are closer to the nucleus than $p$ electrons,$sp

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

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(A) The formation of $C-H$ bond in acetylene involves $sp-$hybridised carbon atom.Since $s-$electrons are closer to the nucleus than $p$ electrons,$sp$ hybrid orbitals are more electronegative due to their smaller (in length) and thicker lobes,which increases the time spent by electrons near the nucleus compared to $sp^2$ and $sp^3$ orbitals.Thus,the electrons present in a bond having more $s-$character will be closer to the nucleus.In alkynes $(C \equiv C-H)$ bond,the $s-$character is $50\%$,so the electrons constituting this bond are more strongly attracted by the carbon nucleus.Thus,the acetylenic carbon atom becomes more electronegative in comparison to $sp^2$ and $sp^3$ hybridized carbons,and hence the hydrogen atom present on the carbon atom $(C \equiv C-H)$ can be easily removed as a proton $(H^+)$.

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