Question

Rank the following in order of decreasing rate of reaction with alkoxide ion $\left(C{H}_{3}C{H}_2{O}^{-}\right)$ in a nucleophilic aromatic substitution reaction.

• A. $3>4>1>2$
• B. $3>4>2>1$
• C. $2>1>4>3$
• D. $4>3>2>1$

Answer 1

The correct option is A $3>4>1>2$

Decreasing rate of reaction with alkoxide ion $\left(C{H}_{3}C{H}_2{O}^{-}\right)$ in a nucleophilic aromatic substitution reaction is
$3>4>1>2$
in nucleophilic aromatic substitution a nucleophile displaces a goo leaving group such as nitro|halide on an aromatic ring . Since Br is a good then ortho and then meta position leaving group at para position then ortho substituent $\left(N{O}_2\right)$ group hence the rate of reaction varies similarly wrt to the of the leaving group