The acidic hydrogen is present in . . . . . | vedclass

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(A) The acidity of hydrogen atoms in hydrocarbons depends on the hybridization of the carbon atom to which it is attached. In $Ethyne$ $(HC \equiv CH)

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Ethyne

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(A) The acidity of hydrogen atoms in hydrocarbons depends on the hybridization of the carbon atom to which it is attached. In $Ethyne$ $(HC \equiv CH)$,the carbon atoms are $sp$ hybridized. $sp$ hybridization has $50\%$ $s$-character,making the carbon atom more electronegative and thus pulling the electron density of the $C-H$ bond towards itself. This makes the hydrogen atom acidic,allowing it to be removed by strong bases. In $Ethene$ ($sp^2$ hybridized,$33.3\%$ $s$-character) and $Ethane$ ($sp^3$ hybridized,$25\%$ $s$-character),the $s$-character is lower,making the $C-H$ bond less polar and the hydrogen less acidic.

The acidic hydrogen is present in $ . . . . . . $.

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