In the anion HCOO$-$ the two carbon-oxygen bonds are found to be of equal length. What is the reason for it?

Question

In the anion HCOO^$-$ the two carbon-oxygen bonds are found to be of equal length. What is the reason for it?

The C = O bond is weaker than the C-O bond

The anion HCOO- has two resonating structures

The anion is obtained by removal of a proton from the acid molecule

Electronic orbitals of carbon atom are hybridised

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