In the non-conjugated cyclic diene formed by the Birch reduction of an unsubstituted benzene ring (1,4-cyclohexadiene), how many of the carbon atoms in the resulting ring are hybridized?

Question

In the non-conjugated cyclic diene formed by the Birch reduction of an unsubstituted benzene ring (1,4-cyclohexadiene), how many of the carbon atoms in the resulting ring are $sp^2$ hybridized?

Prashant Kotian · Accepted Answer

Correct answer: 4. The Birch reduction of benzene yields 1,4-cyclohexadiene. This molecule contains a six-membered ring with two isolated (non-conjugated) double bonds. The four carbon atoms involved in these two double bonds remain hybridized. The other two carbon atoms on opposite sides of the ring (positions 3 and 6) have been reduced and are now hybridized.

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