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

Electronic orbitals of carbon atom are hybridised
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
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In the anion HCOO the two carbon–oxygen bonds are found to be of equal length. What is the reason for it?

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