Choose the order that has the following C=O groups correctly arranged with respect to increasing resonance stabilization.
(i)
(ii)
(iii)

Question

Choose the order that has the following C=O groups correctly arranged with respect to increasing resonance stabilization. (i) (ii) (iii)

TestHub · Accepted Answer

The more electron donation reaches the carbonyl carbon, the more the C⁺-O⁻ form contributes. The ester has an O lone pair on the carbonyl carbon (+M effect), the ketone has two +I methyl groups and the aldehyde has one.

Order : aldehyde < ketone < ester, that is i < ii < iii.

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