Which of the following is the most stable, and which is the next most stable isomer?

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III > I

I > III

IV > III

II > I

answer is A.

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Detailed Solution

(Both have conjugated system)In (II) 3α-H atom but have isolated system.In (IV) 2-α-H atom & conjugated system but strained ring dueto (C=C) bond outside ring..'. stability order:III > I > II > IV

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