Among the species: $C O_{2}$ , $C H_{3} C O O^{-}$ , $C O$ , $C O_{3}^{2 -}$ , $H C H O$ which has the weakest carbon-oxygen bond?

C O_{2}

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C O

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C O_{3}^{2 -}

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C H_{3} C O O^{-}

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Solution

The correct option is C $C O_{3}^{2 -}$
$C O$ has a triple bond hence has strongest $C - O$ bond. $C O_{2}$ and $H C H O$ have a double bond between $C$ and $O$ , weaker than that in $C O$ . Both $C H_{3} C O O^{-}$ and $C O_{3}^{2 -}$ have resonating structures, but the canonical structures of acetate have more stability than that of $C O_{3}^{2 -}$ , hence $C - O$ bond is the weakest in $C O_{3}^{2 -}$ .

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