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JEE Main levelSingle correct optionDifficulty 2 of 3g1136

Cyclopenta-1,3-diene is far more acidic than cyclohexa-1,3-diene mainly because

Aits conjugate base is antiaromatic
Bits conjugate base is aromatic with 6 pi electrons
Cits conjugate base has 4 pi electrons in a planar ring
Dit has more sp3 carbon atoms

Answer: B

Removal of H+ from the

CH X_{2}

of cyclopentadiene gives the planar cyclopentadienyl anion with 6 pi electrons, which is aromatic and strongly stabilised. Cyclohexa-1,3-diene gives a non-aromatic anion with no such stabilisation.

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