Exams › JEE Advanced › Chemistry

Arrange the species Li2, Li2- and Li2+ in increasing order of stability.

1. Li2 < Li2+ < Li2-
2. Li2- < Li2+ < Li2
3. Li2 < Li2- < Li2+
4. Li2- < Li2 < Li2+

Correct answer: Li2- < Li2+ < Li2

Solution

Li2 has bond order 1, Li2+ has bond order 0.5, and Li2- also has bond order 0.5 but with an electron in an antibonding orbital making it slightly less stable, so the order is Li2- < Li2+ < Li2.

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