Question

Why is the answer for 26 ques not 1 and for 27 not 3 ?

Answer 1

Explanation:

26. a < c < b

Because -NO2 group is ortho-para activating group for nucleophile due to "-R" nature. -NO2 in meta position is driven by "-I" natue. So, ortho -NO2 group will be more reactive than meta one as "-R" is dominant over "-I".

27. b < c < a

Because -CH3 group in Ortho will show "+R" group and in meta position will show "+I" group. Which is not reactive for nucleophile. Also "R" nature is dominant over "I" nature. Thus -CH3 in ortho will be less reactive.

hope this will help you.