In which of the following is each of two carbon-oxygen bonds of exactly the same length because of resonance?

A\ce{HCOOCH3}
B\ce{CH3COO-}
C\ce{CH3COOCH3}
D\ce{CH3COOH}

Answer: B

In the acetate ion the negative charge is delocalised over both oxygen atoms, giving two C-O bonds of bond order 1.5. In the acid and the esters, one C=O and one C-O single bond remain distinct.

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