Question

CH₃Br + Nu⁻ → CH₃ - Nu + Br⁻
The decreasing order of the rate of the above reaction with
nucleophiles (Nu⁻) A to D is
[Nu⁻ = (A) PhO⁻, (B) AcO⁻, (C) HO⁻, (D) CH₃O⁻]
(a) A > B > C > D (b) B > D > C > A
(c) D > C > A > B (d) D > C > B > A

Answer 1

Answer:

A option is the answer please mark me as a Brainleis

Answer 2

The decreasing order of the rate of the given reaction with

nucleophiles (Nu⁻) A to D is :

• Nu⁻ = (A) PhO⁻, (B) AcO⁻, (C) HO⁻, (D) CH₃O⁻

• Reaction : CH₃Br + Nu⁻ → CH₃ - Nu + Br⁻

• Let us solve it with help of conjugate base theory.

H20 → HO⁻ + H+

PhOH → PhO⁻ + H+

AcOH → AcO⁻ + H+

CH₃OH → CH₃O⁻ + H+

• Stronger the acidic strength in a compound, weaker will be its conjugate base.

• Order of weak conjugate base :

AcO⁻ > PhO⁻ > HO⁻ > CH₃O⁻

• We know, strong nucleophiles are strong base.

• Therefore, decreasing order of the rate of the given reaction with

nucleophiles is

•CH₃O⁻ > HO⁻ > PhO⁻ > AcO⁻

i.e D > C > B > A

• Option (d) is correct