The order of acidity of compounds I-IV is: | vedclass

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(A) The acidic strength of a compound is directly proportional to the stability of its conjugate base. More stable the conjugate base,stronger is the

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$I < III < II < IV$

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(A) The acidic strength of a compound is directly proportional to the stability of its conjugate base. More stable the conjugate base,stronger is the acid.$I$: Benzyl alcohol $(C_6H_5CH_2OH)$ forms a conjugate base where the negative charge is on the oxygen atom and is not resonance-stabilized by the benzene ring.$II$: Benzoic acid $(C_6H_5COOH)$ forms a carboxylate ion $(C_6H_5COO^-)$ which is resonance-stabilized by two oxygen atoms.$III$: $p$-Cresol $(CH_3-C_6H_4-OH)$ forms a phenoxide ion which is resonance-stabilized,but the electron-donating $+I$ effect of the $-CH_3$ group destabilizes it compared to benzoic acid.$IV$: Benzenesulfonic acid $(C_6H_5SO_3H)$ forms a sulfonate ion $(C_6H_5SO_3^-)$ where the negative charge is delocalized over three highly electronegative oxygen atoms,making it the most stable conjugate base.Comparing the stability of conjugate bases:$I$ (least stable) $Therefore,the order of acidity is $I < III < II < IV$.

The order of acidity of compounds $I-IV$ is:

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