Identify a molecule which does not exist. [2020]

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Solution

Q.
Identify a molecule which does not exist. [2020]

1 ${He}_{2}$

2 ${Li}_{2}$

3 $C_{2}$

4 $O_{2}$

Ans.
(1)

${He}_{2}$ does not exist as it has zero bond order.
$H e_{2} : σ 1 s^{2}, σ^{*} 1 s^{2}$

$Bond order = \frac{1}{2} (N_{b} - N_{a}) = \frac{1}{2} (2 - 2) = 0$

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