Question

Which of the following is true for $S_{n}Ar$ i.e. Nucleophilic Aromatic Substitution reaction?

• A. Stronger the electron withdrawing group, faster is the reaction.
• B. Incoming nucleophile should be more basic than group already present
• C. Incoming nucleophile should be less basic than group already present
• D. Both (a) and (b)

Answer 1

The correct option is D Both (a) and (b)

Effect of EWG on $S_{n}Ar$ i.e. Nucleophilic Aromatic Substitution reaciton:
(a) Stronger the EWG,faster is the reaction.
(b) More the number of EWG, faster is the reaction.
Nucleophile:
Incoming nucleophile should be more basic than group already present.
For the reaction to occur:

$\text{Basicity of}{X}^{-}<\text{Basicity of}{Y}^{-}$