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Bond Order by MOT

Which of the ...

Question

Which of the following has the highest $O - O$ bond energy ?

A

O_{2}

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B

O_{2}^{2 +}

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C

O_{2}^{-}

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D

O_{2}^{2 -}

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Solution

The correct option is A $O_{2}^{2 +}$
Bond order $\propto$ Bond Energy
$O_{2}$ $O_{2}^{2 +}$ $O_{2}^{-}$ $O_{2}^{2 -}$
Bond Order $= \frac{8 - 4}{2}$
$= 2$ $= \frac{8 - 2}{2}$
$= 3$
$= \frac{8 - 5}{2}$
$= 1.5$
$= \frac{8 - 6}{2}$
$= 1$
$O_{2}^{2 +}$ has this Highest Bond Order and hence require the Highest Bond Energy.

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