JEE Main · 2022 · 29 Jun 2022 · Shift 2 · Hydrocarbons

The stable carbocation formed in the above reaction is :

(A) $CH_{3} CH_{2} C \oplus H_{2}$
(B) $CH_{3} C \oplus H_{2}$
(C) $CH_{3} - C \oplus H - CH_{3}$ ✓ Correct
(D)(see structure)

Answer: (C)

Solution

In the given reaction, the most stable carbocation formed is the isopropyl cation

CH_{3} - C \oplus H - CH_{3}

(option C). This is a secondary carbocation stabilized by hyperconjugation from six α-hydrogens (three from each methyl group). Among the options, this secondary carbocation is more stable than the primary carbocations in options (A) and (B). Option (D) shows a benzylic carbocation, but based on the reaction conditions shown, the isopropyl cation is the product formed.

JEE Main · 2022 · 29 Jun 2022 · Shift 2 · Single correct option

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