NEET Questions Solved


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 π2px22py2,                       BO= 10-52= 2.5N22-(7+7+2=16)=σ1s2, σ*1s2, σ2s2,  σ*2s2, σ2pz2 π2px22py2,π2px1π2px1*                       BO = 10-62=2

Hence, the increasing order of bond order is,

                     N22- < N2- < N2

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