Question

N2 and O2 are converted into monocations, N2+ and O2+ resp. Which is wrong?

(a) In N2+,the N-N bond weakens. (b) In O2+,the O-O bond order increases.

(c) In O2+, paramagnetism decreases. (d) N2+ becomes diamagnetic.

Answer 1

d option is incorrect...

Answer 2

For N2  

σ1s2<σ*1s2< σ2s2<σ*2s2 <П2px=2py4 <σ2pz2  <П*2px=2py < σ*2pz  

For O2

σ1s2<σ*1s2< σ2s2<σ*2s2 <σ2pz2 <П2px=2py4  <П*2px=2py2 < σ*2pz  

a) In N2+,the electron is removed from bonding molecular orbital.Hence bond order decreases and  N-N bond weakens.

b) In O2+,the electron is removed from anti bonding molecular orbital.Hence O-O bond order increases.

c) In O2+, the no of unoaired electron decreases and hence paramagnetism decreases.

d) In N2+, there is one unpaired electron.It is paramagnetic. This statement is wrong.