Solved: Chemistry Question for NEET

NEET ChemistryEasy

Identify a molecule which does not exist.

$He_2$

$Li_2$

$C_2$

$O_2$

Step-by-Step Solution

For $He_2$ molecule, electronic configuration is $\sigma 1s^2, \sigma^* 1s^2$ . Bond order = $\frac{1}{2}[N_b - N_a] = \frac{1}{2}[2 - 2] = 0$ . Since, bond order is zero, so $He_2$ molecule does not exist.

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