Chemical Bonding And Molecular Structure Ques 117
117. Identify a molecule which does not exist.
[2020]
(a) $Li_2$
(b) $C_2$
(c) $O_2$
(d) $He_2$
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Answer:
Correct Answer: 117.(d)
Solution:
(d) For $He_2$ molecule, Electronic configuration is $\sigma 1 s^{2}, \sigma^{*} 1 s^{2}$
Bond order $=\frac{1}{2}(N_b-N_a)=\frac{1}{2}(2-2)=0$
Since, bond order of $He_2$ is zero, so it does not exist.
BETA
