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Standard XII

Chemistry

Hyperconjugation

Decreasing or...

Question

Decreasing order of stability of $C = C$ bond in the following compound is:

p > q > r

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r > q > p

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p > r > q

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q > r > p

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Solution

The correct option is A p > q > r
The stability of alkene can be determined by counting the number of $α$ hydrogens. More the number of $α$ hydrogens, more stable will be the alkene.
The $C = C$ bond indicated as p has 10 $α$ -H, q has 4 $α$ -H, and r has only 1 $α$ -H. Therefore, the stability order of the $C = C$ bond is:
p > q > r

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Hyperconjugation

Standard XII Chemistry

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Decreasing order of stability of C=C bond in the following compound is:

Decreasing order of stability of $C = C$ bond in the following compound is: