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NEET levelSingle correct optionDifficulty 1 of 3cb088

Which of the following has the longest carbon-oxygen bond?

A $CH X_{3} OH$ (C-O bond)
B $CO X_{2}$
C $CO X_{3} X^{2 -}$
D $CO$

Answer: A

Bond order of C-O is 3 in

CO

, 2 in

CO X_{2}

, 1.33 in

CO X_{3} X^{2 -}

and 1 in

CH X_{3} OH

. The lowest bond order gives the longest bond.

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