The correct stability order of the following species is:
A
(II) > (IV) > (I) > (III)
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B
(I) > (II) > (III) > (IV)
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C
(II) > (I) > (IV) > (III)
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D
(I) > (III) > (II) > (IV)
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Solution
The correct option is D (I) > (III) > (II) > (IV)
Carbocations are stabilised by resonance and hyperconjugation in (I) and (III), whereas for (II) and (IV) only hyperconjugation plays the role in stabilisation.