Arrange these hexadienes in order of expected decreasing stability.

V > I I > I > I I I > I V

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I I I > I V > I > I I > V

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I V > I I I > I I > V > I

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I V > I I I > I > I I > V

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Solution

The correct option is B $I I I > I V > I > I I > V$
Consider these criteria s for stability-
-Conjugation(Resonance)
-Cis trans configuration
-Hyperconjugation

III, being conjugated as well as trans-trans, is most stable followed by IV which is conjugated but has cis configuration at one of the double bond,and trans form is more stable than cis V is least substituted, (less hyperconjugation) hence, least stable. I and II both have same no. of hydrogens for hyperconjugation but II is cis form so it is less stable.

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