Multiple choice

In which of the following ionization processes, the magnetic behaviour has changed and the bond order has increased?

  1. N2→ N2+

  2. O2→ O2+

  3. F2→ F2-

  4. C2→C2+

  5. All of the above
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B Correct answer
Explanation

O2 (16 e-) : ϭ1s2 ϭ*1s2 ϭ2s2 ϭ*2s2 ϭ2pz2 π2px2 π2py2 ϭ*2pz2 Bond order  = ½ (6-2) = 2, diamagnetic

O2+ (15 e-) : ϭ1s2 ϭ*1s2 ϭ2s2 ϭ*2s2 ϭ2pz2 π2px2 π2py2 ϭ*2pz1 Bond order  = ½ (6-1) = 2.5, paramagnetic

Magnetic behaviour changes from diamagnetic to paramagnetic; Bond order increased

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