The correct order of stability of following carbocations is:

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Canvas Classes · Accepted Answer

Step 1: Analyzing Stability Factors
1. Tropylium Cation (C): It is aromatic ( electrons,  where ), giving it exceptional stability.
2. Triphenylmethyl Cation (A): The positive charge is delocalized over 3 phenyl rings.
3. Diphenylmethyl Cation (B): The charge is delocalized over 2 phenyl rings.
4. 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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