With respect to the compounds I-V,choose the | vedclass

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(C) The acidity of a compound depends on the stability of its conjugate base. $(A)$ The conjugate base of compound $I$ (triphenylmethane) is a triphen

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$A, B, C$

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(C) The acidity of a compound depends on the stability of its conjugate base. $(A)$ The conjugate base of compound $I$ (triphenylmethane) is a triphenylmethyl carbanion,which is resonance-stabilized by three phenyl rings. Thus,statement $(A)$ is correct.$(B)$ The conjugate base of compound $IV$ (cyclopentadiene) is the cyclopentadienyl anion,which has $6\pi$ electrons and is aromatic. Thus,statement $(B)$ is correct.$(C)$ The $-NO_2$ group is a strong electron-withdrawing group ($-I$ and $-M$ effect). When attached to benzene (compound $II$),it stabilizes the conjugate base (phenyl anion) by withdrawing electron density,thereby increasing the acidity. Thus,statement $(C)$ is correct.$(D)$ Based on $pK_a$ values: $IV$ $(16)$ > $V$ $(25)$ > $I$ $(33.3)$ > $II$ $(43)$ > $III$ $(50)$. The order of acidity is $IV > V > I > II > III$. Thus,statement $(D)$ is correct.Therefore,statements $(A), (B), (C),$ and $(D)$ are all correct. However,given the options,the most appropriate choice is $(C)$.

Similar Questions

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