A)
B)
C)
D)
Correct Answer: D
Solution :
[d]: Hyper conjugation is the delocalization of sigma electrons with \[\pi \text{-}\]bond. In carbocation, hyper conjugation is possible only when \[\alpha \text{-}\]hydrogen is present, so in carbocations [a], [c] and [d] hyper conjugation is possible while [b] is stabilized by the interaction of the cyclopropyl bonding orbitals with the vacant p-orbital of carbon.
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