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

  • A
    The $C=O$ bond is weaker than the $C-O^-$ bond.
  • B
    The anion is obtained by the removal of a proton from acid molecules.
  • C
    The anion has two equivalent contributing resonating structures.
  • D
    Carbon is present in the $sp^2$ state of hybridization.

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