Among the three isometric trimethylbenzenes:
(i). 1,2,3
(ii) 1,2,4
(iii).1,3,5 The least stable and the most stable isomers respectively:

Options

A. (iii) and (i)
B. (ii) and (iii)
C. (i) and (iii)
D. (i) and (ii)

Answer

3

Explanation

In (i), the `CH_(3)` groups are as close as possible lending to maximum steric hindrance while in (iii), the`CH_(3)` groups are as far apart as possible leading to minimum steric hindrance.