Bond order normally gives idea of stability of a molecular species. All the molecules viz. H2, Li2 and B2 have the same bond order yet they are not equally stable. Their stability order is
Bond order normally gives idea of stability of a molecular species. All the molecules viz. H2, Li2 and B2 have the same bond order yet they are not equally stable. Their stability order is
(a) H2 > Li2 > B2
(b) Li2 > H2 > B2
(c) Li2 > B2 > H2
(d) B2 > H2 > Li2
Correct answer: (a) H2 > Li2 > B2
Explanation:
The molecular orbital configuration of the given molecules is
H2 = σ(1s)2(no electron anti-bonding)
Li2 = σ(1s)2σ*(1s)2σ(2s)2
(two anti-bonding electrons)
B2 = σ(1s)2σ*(1s)2σ(2s)2σ*(2s)2
π(2px)1 = π(2py)1
(4 anti-bonding electrons)
Though the bond order of all the species are same (B.O = 1) but stability is different. This is due to difference in the presence of no. of anti-bonding electron.
Higher the no. of anti-bonding electron lower is the stability hence the correct order is H2 > Li2 > B2
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