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Question

The correct order of stability for the following species is:


A

(II) > (IV) > (I) > (III)

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B

(I) > (II) > (III) > (IV)

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C

(I) > (III) > (IV) > (II)

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D

(I) > (III) > (II) > (IV)

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Solution

The correct option is D

(I) > (III) > (II) > (IV)


i) (I) is most stable, since it is stabilised by resonance and has six αH atoms (hyperconjugation).

ii) (III) is less stable than (I) but more stable than (II) and (IV), since it is also stabilised by resonance and has three αH atoms (hyperconjugation).

iii) (II) is more stable than (IV) and is stabilised only by hyperconjugative structure (five αH atoms).


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