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

In the anion $\mathrm{HCOO}^{-}$the two carbon-oxygen bonds are found to be of equal length. What is the reason for it?
  1. The $\mathrm{C}=\mathrm{O}$ bond is weaker than the $\mathrm{C}-\mathrm{O}$ bond
  2. The anion $\mathrm{HCOO}^{-}$has two resonating structures
  3. The anion is obtained by removal of a proton from the acid molecule
  4. Electronic orbitals of carbon atom are hybridised

Asked in: JEE Main 2003

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