Which of the following molecule does not exist ?

H e_{2}

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H - H^{+}

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H e - H e^{+}

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L i_{2}

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Solution

The correct option is A $H e_{2}$
In $H e_{2}$ molecule, the bond order is zero as it contains equal number of bonding and antibonding electrons. Hence, it does not exists.

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H e

H e_{2}

Correct order of radius of the $1^{s t}$ orbit of $H$ , $H e^{+}, L i^{2 +}, B e^{3 +}$ is:

H e_{2}

H, H e^{+}, L i^{2 +}, B e^{3 +}

H < H e^{+} < L i^{2 +} < B e^{3 +}

L i^{2 +}, H e^{+}

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