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Which of the following molecule doesn’t exist?

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in Chemistry – Class 11 by (148k points)
Which of the following molecule doesn’t exist?

(a) O2

(b) H2

(c) He2

(d) N2

I have been asked this question in exam.

The doubt is from Bonding in Some Homonuclear Diatomic Molecules in section Chemical Bonding and Molecular Structure of Chemistry – Class 11

1 Answer

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Best answer
Correct option is (b) H2

Explanation: The electronic configuration of He2 is σ1s^2σ*1s^2. Here NA = NB (where NA as the number of anti-bonding molecular orbitals and NB as the number of bonding molecular orbitals). So the molecule He2 doesn’t exist.

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