Identify a molecule which does not exist.

Identify a molecule which does not exist.

${Li}_{2}$
$C_{2}$
$O_{2}$
${He}_{2}$

Solution

${He}_{2} =$ Total electron $= 4$

$= σ_{1 s^{2}}^{} σ_{1 s^{2}}^{*} \Rightarrow B . O . = \frac{1}{2} [Nb - Na] = \frac{1}{2} [2 - 2] = 0$

Bond order $= 0$ , so ${He}_{2}$ does not exist.

Asked in: NEET 2020 (Phase 1)

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