Organic Chemistry — Medium JEE chemistry MCQ
**[JEE Mains 2026]** Which of the following is the correct order of reactivity of the given nucleophiles when treated with CH₃Br in methanol?
I. CH₃O⁻ II. CH₃S⁻ III. CH₃Se⁻ IV. Cl⁻
- A. IV < I < II < III
- B. I < IV < II < III
- C. I < II < III < IV
- D. III < II < I < IV
Solution
In protic solvents like methanol, nucleophilicity increases down the group due to decreased solvation.
Larger atoms are less solvated, hence more nucleophilic.
Order: Cl⁻ < CH₃O⁻ < CH₃S⁻ < CH₃Se⁻