Identify a molecule which does not exist.

O_{2}

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H e_{2}

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L i_{2}

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C_{2}

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Solution

The correct option is B $H e_{2}$
Diatomic molecule for which bond order is zero or negative does not exist.

MOT of $H e_{2}$ is $(σ_{1 s})^{2} (σ_{1 s}^{*})^{2}$

Molecule $B O$

$C_{2}$ $2$

$O_{2}$ $2$

$H e_{2}$ $0$

$L i_{2}$ $1$

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