Rank the compounds below from most stable to the least stable towards catalytic hydrogenation:

I > I I > I I I

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I I > I I I > I

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I I I = I > I I

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I I > I = I I I

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Solution

The correct option is C $I I > I I I > I$
The rank of the given compounds from most stable to the least stable towards catalytic hydrogenation is $I I > I I I > I$ .

II, being conjugated, most substituted, is most stable followed by III.

Note: Higher the degree of substitution, more stable is the alkene and conjugated alkene is more stable than non conjugated alkene.

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