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JEE Advanced levelSingle correct optionDifficulty 3 of 3cb101

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

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

Answer: B

Average C-O bond orders from resonance: 3 in

CO

, 2 in

CO X_{2}

, 1.5 in

HCOO X^{-}

(one double plus one single over two equivalent bonds) and 1.33 in

CO X_{3} X^{2 -}

(4/3). Bond length rises as bond order falls.

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