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JEE Advanced levelSingle correct optionDifficulty 3 of 3pb196

The correct order of $C - O$ bond length is

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

Answer: C

The

C - O

bond order is 3 in CO, 2 in

CO X_{2}

, and 4/3 = 1.33 in the carbonate ion (three resonance forms share one

π

bond among three C-O bonds). Bond length falls as bond order rises, so CO is shortest and carbonate is longest.

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