Question

Which one of the following factors proceeds more rapidly, unimolecular nucleophilic substitution reaction?

• A. Aprotic solvent
• B. Stronger nucleophile
• C. Weaker nucleophile
• D. Polar protic solvent

Hint:

SN1 goes through a carbocation, which polar protic solvents stabilise.

Answer 1

The Correct Option is D

Step 1: Rule out the nucleophile options
SN1 rate $=k[\text{RX}]$, with no nucleophile term, so (B) and (C) have no effect.

Step 2: Choose the solvent
Polar protic solvents (water, alcohols) stabilise ions, so they help. Option (D).

Final Answer:
Option (D). \[ \boxed{\text{(D)}} \]