Q.3 The stability of carbanions in the following                             (1) d>b>c>a (2) a>c>b>d (3) a>b>c>d (4) b>c>d>a

Higher the number of electron releasing group lower will be the stability of carbanion, and vice versa. So the order of stability of carbanations is i>ii>iii>ivi>ii>iii>iv Hence c is the correct answer.