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JEE Main2013ChemistryChemical Bonding and Molecular StructureActual

Which one of the following molecules is expected to exhibit paramagnetic behaviour?

Options

  1. AO 2
  2. BO 2 -2
  3. CC 2
  4. DN 2

Correct answer

A. O 2

Step-by-step solution

M.O. Electronic configuration. O 2 = &#963; 1 s 2 &#60; &#963; * 1 s 2 &#60; &#963; 2 s 2 &#60; &#963; * 2 s 2 &#60; &#963; 2 p z 2 &#60; &#960; 2 p y 2 = &#960; 2 p x 2 &#60; &#960; * 2 p y 1 = &#960; * 2 p x 1 Paramagnetic O 2 - 2 = &sigma; 1 s 2 < &sigma; * 1 s 2 < &sigma; 2 s 2 < &sigma; * 2 s 2 < &sigma; 2 p z 2 < &pi; 2 p y 2 = &pi; 2 p 2 x < &pi; * 2 p y 2 = &pi; * 2 p x 2 Diamagnetic C 2 = &#963; 1 s 2 &#60; &#963; * 1 s 2 &#60; &#963; 2 s 2 &#60; &#963; * 2 s 2 &#60; &#960; 2 p x 2 = &#960; 2 p y 2 Diamagn

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