1.

Explain why the bond order of N2 is greater than N2+, but the bond order of O2 is less than that of O2+.

Answer»

N2 = (σ1s)2 (σ*1s)2 (σ2s)2 (σ*2s)2

(σ2px)2 (π2py)2 (π2pz)2

Bond order = 1/2 (Nb - Na) = 1/2 (10 - 4) = 3

N2+ = (σ1s)2 (σ*1s)2 (σ2s)2 (σ*2s)2 (π2px)2 [π2py]2 [σ2pz]1

Bond order = 1/2 (7 - 2) = 2.5

Hence bond order of N2 is greater than N2+

O2+ = (σ1s)2 (σ*1s)2 (σ2s)2 (σ*2s)2 (σ2px)2 (π 2py)2 (2π 2pz)2 (π* 2py)1

Bond order = 1/2 (Nb - Na) = 1/2 (10 - 5) = 2.5

Hence Bond order of O2 is less than of O2+.



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