Question

The most stable carbanion among the following is:

• A.
• B.
• C.
• D.

Hint:

The stability of a carbanion increases with the presence of electron-withdrawing groups like nitro (\(O_2N\)), which stabilize the negative charge.

Answer 1

The Correct Option is D

Step 1: Carbanion Stability
The stability of a carbanion depends on the ability of the negative charge to delocalize.
Electron-withdrawing groups such as nitro (\(O_2N\)) stabilize the carbanion by stabilizing the negative charge through resonance.
Step 2: Explanation of Other Options
Option (a), (b), and (c) have ethyl or methyl groups which are electron-donating and hence do not stabilize the carbanion effectively.

Option (d) with the nitro group (electron-withdrawing) attached to the benzene ring provides greater stability to the carbanion.
Step 3: Conclusion Thus, the most stable carbanion is the one with the nitro group attached (option d).