Identify the most stable structure in each of the following:

Answer

A-b; B - c; C-a; D-c; E-a; F-b; G-d

Explanation

(A) `7 alpha` H in (b) (B) `6alpha` H in (c) (C) `7 alpha` Hin (a) (D) `8alpha` Hin (c)
(E) `6alpha` H + no van der Waal repulsion in (a) (F) extended conjugation upto `3pi` -bond in (b)
(G) octet complet is more stable in (d).