Question

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Answer 1

Answer:

(a)

Explantion:

Nucleophilic substitution is faster when there are deactivating group. since no2 is ortho para deactivating, it increases positive character at those positions. so nucleophile attackat those centres faster.

also even though halogens are +R group, they are ortho para deactivating since their inductive effect is more pronounced. since cl has more elctronegativity than br, it has more inductive effect. option3 isless than optin 2 because the positive character is at ortho position of no2 and cl inductive effect decrease due to more distance