JEE Main Chemistry question

Which of the following compounds is the most stable, among a set of cyclic dienes with differing degrees of conjugation?

(A)The conjugated cyclohexa-1,3-diene (two conjugated double bonds)Correct
(B)A cyclohexadiene with two isolated (non-conjugated) double bonds
(C)A cross-conjugated cyclic triene
(D)Cyclohexa-1,4-diene (isolated, non-conjugated double bonds)

Answer: (A)

Solution

Conjugated dienes are more stable (lower in energy, higher resonance stabilisation) than their isomers with isolated or cross-conjugated double bonds, because

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Question ID VK-142376