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  4. Determine the C-O bond order average formal charge on each oxygen atom in HCO 2- respectively?

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Q. Determine the $C-O$ bond order & average formal charge on each oxygen atom in $HCO _{2}^{-}$ respectively?

Solution:

$H - \underset{\overset{||}{O}}{C} - O ^{-}$
Formal charge $=\frac{\text { charge }}{\text { no. of }^{\prime} \text { O'atom }}=\frac{-1}{2}$
$=-0.5$
Bond order $=2- | F.C.|=2-0.5=1.5$