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JEE Main Chemistry question

ChemistryOrganic Chemistry - Some Basic Principles and TechniquesJEE Main

Consider the following carbocations: (I) C₆H₅CH₂⁺, (II) C₆H₅CH₂CH₂⁺, (III) C₆H₅ĊHCH₃ (as cation), (IV) C₆H₅Ċ(CH₃)₂ (as cation). The stability order is

Answer: (A)

Solution

(I), (III) and (IV) are all benzylic cations (directly conjugated with the ring) and increase in stability with increasing alkyl substitution at the cationic carbon: benzyl (I, primary) < 1-phenylethyl (III,

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Question ID VK-139073