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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pn071

Consider the species $O X_{2} X^{+}$ , $O X_{2}$ , $O X_{2} X^{-}$ and $O X_{2} X^{2 -}$ . Select the correct statement(s).

A $O X_{2} X^{+}$ has a bond order of 2.5
B $O X_{2} X^{2 -}$ is diamagnetic
CThe O-O bond length in $O X_{2} X^{-}$ is greater than in $O X_{2}$
DThe bond order of $O X_{2} X^{2 -}$ is 2

Answer: A, B, C

Bond orders from MO theory:

O X_{2} X^{+}

2.5,

O X_{2}

2,

O X_{2} X^{-}

1.5,

O X_{2} X^{2 -}

1. The peroxide ion has all electrons paired (diamagnetic). A lower bond order in

O X_{2} X^{-}

means a longer bond than in

O X_{2}

. The bond order of

O X_{2} X^{2 -}

is 1, so D is wrong.

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