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

ChemistryGeneral Organic ChemistryBITSATBITSAT 2011

Options:

A The $\mathrm{C}=\mathrm{O}$ bond is weaker than the $\mathrm{C}-\mathrm{O}$ bond.
B The anion $\mathrm{HCOO}^{-}$ has two resonating structures.
C The anion is obtained byremoval of a proton from the acid molecule.
D Electronic orbitals of carbon atom are hybridised.