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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3cb108

Select all the correct statements about bond lengths.

AThe O-O bond in $H X_{2} O X_{2}$ is longer than in $O X_{2}$
BThe bond in $N X_{2} X^{+}$ is longer than in $N X_{2}$
CThe C-O bond in $CO X_{3} X^{2 -}$ is shorter than in $CO X_{2}$
D $O X_{2} X^{+} < O X_{2} < O X_{2} X^{-}$ in O-O length

Answer: A, B, D

Bond orders are 2.5, 2 and 1.5 for

O X_{2} X^{+}

,

O X_{2}

and

O X_{2} X^{-}

, so the lengths increase in that order.

N X_{2} X^{+}

has order 2.5 against 3 for

N X_{2}

, hence longer.

H X_{2} O X_{2}

has an O-O single bond, longer than the double bond of

O X_{2}

.

CO X_{3} X^{2 -}

has order 1.33 against 2 in

CO X_{2}

, so it is longer, not shorter.

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