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Question
The correct order of stability for the following species is:
The correct order of stability for the following species is:
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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 α−H 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 α−H atoms (hyperconjugation).
iii) (II) is more stable than (IV) and is stabilised only by hyperconjugative structure (five α−H atoms).
(I) > (III) > (II) > (IV)
i) (I) is most stable, since it is stabilised by resonance and has six α−H 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 α−H atoms (hyperconjugation).
iii) (II) is more stable than (IV) and is stabilised only by hyperconjugative structure (five α−H atoms).
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