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JEE Main levelOne or more correct optionsDifficulty 2 of 3g1035

In which of the following ions or molecules are all the C-O bonds of equal length?

A $HCOOH$
B $CH X_{3} COOCH X_{3}$
C $HCOO X^{-}$
D $CO X_{3} X^{2 -}$

Answer: C, D

In the carbonate and formate ions the negative charge is delocalised equally over equivalent oxygens, so the C-O bonds are identical.

HCOOH

and

CH X_{3} COOCH X_{3}

have a C=O and a C-O single bond that are different in length.

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