Which among the given acids has the lowest pK | vedclass

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(C) The $pKa$ value is inversely proportional to the acid strength. $A$ lower $pKa$ value indicates a stronger acid.Acid strength is determined by the

Vedclass · Accepted Answer

Nitroacetic acid

Vedclass · Answer

(C) The $pKa$ value is inversely proportional to the acid strength. $A$ lower $pKa$ value indicates a stronger acid.Acid strength is determined by the electron-withdrawing effect ($-I$ effect) of the substituent attached to the acetic acid molecule $(X-CH_2-COOH)$.The stronger the $-I$ effect of the group $X$,the more stable the conjugate base $(X-CH_2-COO^-)$ becomes,and the stronger the acid.The $-I$ effect order for the given substituents is: $-NO_2 > -CN > -Cl > -Br$.Therefore,the acid strength order is: $	ext{Nitroacetic acid} > 	ext{Cyanoacetic acid} > 	ext{Chloroacetic acid} > 	ext{Bromoacetic acid}$.Since $	ext{Nitroacetic acid}$ is the strongest acid,it has the lowest $pKa$ value.

Which among the given acids has the lowest $pKa$ value?

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