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JEE Advanced levelSingle correct optionDifficulty 3 of 3pb038

Arrange the species $CO$ , $CO X_{2}$ and $CO X_{3} X^{2 -}$ in increasing order of $C - O$ bond length.

A $CO X_{3} X^{2 -} < CO X_{2} < CO$
B $CO X_{2} < CO < CO X_{3} X^{2 -}$
C $CO < CO X_{2} < CO X_{3} X^{2 -}$
D $CO < CO X_{3} X^{2 -} < CO X_{2}$

Answer: C

Bond lengths decrease as bond order increases. The

C - O

bond order is 3 in

CO

, 2 in

CO X_{2}

and

4/3

(resonance average) in

CO X_{3} X^{2 -}

. So the order of increasing length is

CO < CO X_{2} < CO X_{3} X^{2 -}

.

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