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JEE Advanced levelSingle correct optionDifficulty 3 of 3cb105

The correct order of O-O bond length in $O X_{2}$ , $O X_{3}$ and $H X_{2} O X_{2}$ is

A $O X_{2} < H X_{2} O X_{2} < O X_{3}$
B $O X_{2} < O X_{3} < H X_{2} O X_{2}$
C $O X_{3} < O X_{2} < H X_{2} O X_{2}$
D $H X_{2} O X_{2} < O X_{3} < O X_{2}$

Answer: B

The O-O bond order is 2 in

O X_{2}

, 1.5 in

O X_{3}

(two resonance forms) and 1 in

H X_{2} O X_{2}

. The bond length order is therefore

O X_{2}

(121 pm) <

O X_{3}

(128 pm) <

H X_{2} O X_{2}

(148 pm).

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