Three resonating structures for buta-1,3-diene is given:The decreasing energy order is:

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I > II > III

III > II > I

III > I > II

II > I > III

answer is B.

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Detailed Solution

Higher stability ⇒ Lower energyI ⇒ uncharged structure, most stable, less energyII ⇒ uncharged structure, most stable, less energyII is more stable than III, because unlike charges are more closerto each other or lesser charge separation means more stable.Therefore energy of II < III.Thus order is:III>II>I

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