Which of the following is the correct order of the dominating power of the given effects on the stability of intermediates?
I. Resonance effect II. Hyperconjugation
III. Inductive effect IV. Aromaticity

IV > I > II > III

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IV > II > III > I

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I > IV > III > II

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III > II > IV > I

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Solution

The correct option is A IV > I > II > III
The correct order of the dominating power of the different effects on the stability of intermediates can be remembered using the trick "AERHI".
A = Aromaticity
E = Equivalent resonating structures
R = Resonance effect
H = Hyperconjugation
I = Inductive effect

Therefore, the correct order is IV > I > II > III. Hence option (a) is correct.

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