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According to molecular orbital theory which of the following lists rank the nitrogen species in terms of increasing bond order ?
(a) N2- < N2 < N22-
(b) N22- < N2- < N2
(c) N2 < N22- < N2-
(d) N2- < N22- < N2
(b) According to the molecular orbital theory (MOT),
N2(7+7=14) = σ1s2, σ*1s2, σ2s2, σ*2s2, π2px2 ≈ 2py2, σ2pz2 Bond Order = 10-42 = 3N2-(7+7+1=15) =σ1s2, σ*1s2, σ2s2, σ*2s2, σ2pz2 π2px2≈2py2, BO= 10-52= 2.5N22-(7+7+2=16)=σ1s2, σ*1s2, σ2s2, σ*2s2, σ2pz2 π2px2≈2py2,π2px1≈π2px1* BO = 10-62=2
Hence, the increasing order of bond order is,
N22- < N2- < N2