Which of the following cannot exists on the basis of M.O. theory ?

C_{2}

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H e_{2}^{+}

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H_{2}^{+}

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H e_{2}

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Solution

The correct option is C $H e_{2}$
According to M.O theory, the bond orders of $C_{2}$ , $H e_{2}^{+}$ , $H_{2}^{+}$ and $H e_{2}$ are $2, 0.5, 0.5$ and $0$ respectively.

Hence, $H e_{2}$ cannot exist as it has zero bond order.

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Similar questions

Which of the following cannot exist on the basis of MO theory?

C_{2}, L i_{2}, O_{2}^{+}, H e_{2}^{+}

H e

H e_{2}

C_{2}

H e_{2}

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