JEE Main 202624 JanuaryMorning Shift
- Exam
- JEE Main
- Year
- 2026
- Date
- 24 January
- Shift
- Morning Shift
- Subject
- Chemistry
- Chapter
- General Organic Chemistry
JEE Main 2026 · 24 January · Morning Shift · Chemistry · General Organic Chemistry
Arrange the following carbanions in the decreasing order of...
Arrange the following carbanions in the decreasing order of stability.
Choose the correct answer from the options given below:
Choose the correct answer from the options given below:
Options
- AI IV II V III
- BI II IV V III
- CIV I II V III
- DIV II I III V
Correct answer
C. IV I II V III
Step-by-step solution
Carbanion stability increases with electron-withdrawing groups (stabilize negative charge) and decreases with electron-donating groups (destabilize negative charge).
IV has CHO (strongly electron-withdrawing by inductive effect), most stable.
I has Br (weakly electron-withdrawing).
II is pure benzyl with resonance from ring.
V has CH₃ (weakly electron-donating).
III has OCH₃ (strongly electron-donating, destabilizes the carbanion).
The critical factor is inductive electron-withdrawing ability:
CHO > Br > H > CH₃ > OCH₃.
Therefore: IV > I > II > V > III.
IV has CHO (strongly electron-withdrawing by inductive effect), most stable.
I has Br (weakly electron-withdrawing).
II is pure benzyl with resonance from ring.
V has CH₃ (weakly electron-donating).
III has OCH₃ (strongly electron-donating, destabilizes the carbanion).
The critical factor is inductive electron-withdrawing ability:
CHO > Br > H > CH₃ > OCH₃.
Therefore: IV > I > II > V > III.