The correct order of stability of following carbocations is:
General Organic Chemistry (GOC) · Class 11 · JEE Main Previous Year Question
The correct order of stability of following carbocations is:
- a✓
C > A > B > D
- b
B > C > A > D
- c
C > B > A > D
- d
A > B > C > D
C > A > B > D
pKr+ provides a quantitative measure of carbocation stability. A HIGHER (more positive) value indicates GREATER stability.
- Tropylium Cation (C): It is aromatic ( electrons, where ), giving it exceptional stability.
- Triphenylmethyl Cation (A): The positive charge is delocalized over 3 phenyl rings.
- Diphenylmethyl Cation (B): The charge is delocalized over 2 phenyl rings.
- Sec-butyl Cation (D): Only stabilized by inductive effect and hyperconjugation.
Step 2: Stability Order Stability decreases in the order: Tropylium > Triphenylmethyl > Diphenylmethyl > Secondary alkyl.
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