Correct order of stability of above carbocations is:

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Canvas Classes · Accepted Answer

Step 1: Evaluating Carbocation Stability
- (A) Benzyl Cation: High resonance stabilization from the phenyl ring. (Most stable).
- (C) Ethyl Cation: Stabilized by hyperconjugation ( and 3 H-atoms). (More stable than vinyl).
- (B) Vinyl Cation: Positive charge on  carbon. (Very unstable).
- (D) Ethynyl Cation: Positive charge on  carbon. (Least stable due to high electronegativity of  carbon).

Step 2: Conclusion
Order: (A)  (C)  (B)  (D).

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