Acetylenyl hydrocarbons are acidic because ..

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(A) The acidity of terminal alkynes like acetylene $(HC \equiv CH)$ is due to the $sp$ hybridization of the carbon atom.In $sp$ hybridization,the carb

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The electron density of the $C-H$ sigma bond in acetylene is closer to the carbon atom,which has $50\%$ $s-$character.

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(A) The acidity of terminal alkynes like acetylene $(HC \equiv CH)$ is due to the $sp$ hybridization of the carbon atom.In $sp$ hybridization,the carbon atom has $50\%$ $s-$character.Due to higher $s-$character,the electrons in the $C-H$ sigma bond are held more strongly by the carbon atom,making the hydrogen atom more acidic and easily removable as a proton $(H^+)$.

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