Which of the following bonds is most acidic?

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Question

(C) The acidity of a $C-H$ bond depends on the $s$-character of the hybrid orbital of the carbon atom. Greater $s$-character means the electrons are h

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$sp-C-H$

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(C) The acidity of a $C-H$ bond depends on the $s$-character of the hybrid orbital of the carbon atom. Greater $s$-character means the electrons are held more tightly by the nucleus,making the conjugate base more stable. The $s$-character in different hybridizations is: $sp$ $(50\%)$ > $sp^2$ $(33.3\%)$ > $sp^3$ $(25\%)$. Therefore,the $sp-C-H$ bond is the most acidic because the resulting carbanion is the most stable due to the highest electronegativity of the $sp$-hybridized carbon.

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