Greater the bond order, shorter is the bond length.
∴ Bond order
∝ (i) Electronic configurations and bond orders of
C2 and
C22− ions :
EC of
Bond order
=(6−2)=2 EC of
C22−=KKσ2s2,2s2,π2px2,π2py2,σ2pz2 Bond order
=(8−2)=3 ∴ The order of bond lengths :
C2>C22− (ii) Electronic configurations and bond orders of
B2+ and
B2 EC of
B2=KKσ2s2,2s2,π2px1,π2py1 Bond order
=(4−2)=1 EC of
B2+=KKσ2s2,2s2,π2px1 Bond order
=(3−2)= ∴ The order of bond lengths :
B2+>B2 (iii) Electronic configurations and bond orders of
Li2 and
Li2+ EC of
Li2=KKσ2s2 Bond order
=(2−0)=1 EC of
Li2+=KKa2s1 Bond order
=(1−0)= ∴ The order of bond lengths :
Li2+>Li2 (iv) Electronic configurations and bond orders of
Bond order
=(8−2)=3 EC of
Bond order
=(7−2)=2.5 ∴ The order of bond lengths
=N2+>N2 (v) Electronic configurations and bond orders of
O2 and
O2− EC of
Bond order
=(8−4)=2 EC of
Bond order
=(8−5)=1.5 ∴ The correct order of bond lengths
=O2−>O2