Question

The correct order of increasing stabilities for the following carbocations is (1) allyl carbocation (2) neopentyl carbocation (3) benzyl carbocation (4) isobutyl carbocation

• A. $ (1)
• B. $ (4)
• C. $ (2)
• D. $(2) < \,(4) < \,(3) < \, (1)$

Answer 1

Answer: (C)

$ (2)

Answer 2

Allyl carbocation (stabilised by resonance)

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Neopentyl carbocation :

Benzyl carbocation (stabilised by resonance)

Isobutyl carbocation :

Benzyl and allyl carbocations are much more stable due to resonance
Hence, the stability order is
Neopentyl carbocation $