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JEE Main levelSingle correct optionDifficulty 2 of 3cb040

Which order of C-O bond length is correct?

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

Answer: B

Bond lengths decrease as bond order rises. The bond orders are

CO

3,

CO X_{2}

2 and

CO X_{3} X^{2 -}

4/3

. Hence the lengths increase in the order

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

.

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