Question

Rank the nucleophilicities of the following aromatic rings from the most to the least. H :0—N—H :N-0-H a. B>A> b. C>B>A CO>A>B d. A> >B e. B> > A f. A>B>C

Answer 1

. * The order will be c> B)A.. Answer is (6). Aromatic ring will be more nucleophile when more eledon density will be in the ring - In case of (A) RUCO es group ('s highly electron withdrawing group and hence can pull electron from the ting, so there will be erectron deficiency and hence it is considered as less nukleophile. On Se hel® y electron deficient aromatic sing and hence dees nucleophilicity. But on booth (B) and (C) both can donate electron to the aromatic . ning through 'o' and 'W' autom lone pair. But onyzen is more electronegative than Nitrogen. And hence Nitrogen com donate more smoothly than Onyzen. And hence electron density in (e) aromatic ring will be more than that of (B). So con is more nucleophili in aromatic ring than that of (B).