Which is the most acidic of the following?

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(B) The $s-$character of the $C-H$ bond in acetylene ($sp$ hybridized) is $50\%$,which is higher in comparison to $sp^2$ hybridized ethene $(33.3\%)$

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Acetylene

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(B) The $s-$character of the $C-H$ bond in acetylene ($sp$ hybridized) is $50\%$,which is higher in comparison to $sp^2$ hybridized ethene $(33.3\%)$ and $sp^3$ hybridized ethane $(25\%)$.Due to higher $s-$character,the electrons of the $C-H$ bond in acetylene are more strongly held by the carbon nucleus.This increases the electronegativity of the carbon atom,which facilitates the removal of the hydrogen atom as a proton $(H^+)$,making acetylene the most acidic among the given options.

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