Compare the resonance energy of the following compounds. Is the resonance energy of (a) greater than, less than or equal to (b) ?
(a) (b)

Question

Compare the resonance energy of the following compounds. Is the resonance energy of (a) greater than, less than or equal to (b) ? (a) (b)

TestHub · Accepted Answer

Thiophene (resonance energy about 29 kcal/mol) is more stabilised than furan (about 16 kcal/mol), because the sulfur lone pair overlaps well and S is less electronegative than O. So a > b.

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