The most acidic hydrogen is present in:

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(A) The acidity of hydrocarbons depends on the hybridization of the carbon atom to which the hydrogen is attached. The acidity order is: terminal alky

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Ethyne

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(A) The acidity of hydrocarbons depends on the hybridization of the carbon atom to which the hydrogen is attached. The acidity order is: terminal alkynes ($sp$ hybridized) > alkenes ($sp^2$ hybridized) > alkanes ($sp^3$ hybridized).$1$. In ethyne $(HC\equiv CH)$,the carbon is $sp$ hybridized,which has $50\%$ $s$-character. This makes the $C-H$ bond more polar and the conjugate base (acetylide ion) more stable.$2$. In ethene $(CH_2=CH_2)$,the carbon is $sp^2$ hybridized ($33.3\%$ $s$-character).$3$. In ethane $(CH_3-CH_3)$,the carbon is $sp^3$ hybridized ($25\%$ $s$-character).$4$. In benzene $(C_6H_6)$,the carbon is $sp^2$ hybridized.Therefore,ethyne contains the most acidic hydrogen.

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