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JEE Advanced 2007Paper 1
Exam
JEE Advanced
Year
2007
Paper
Paper 1
Subject
Chemistry
Chapter
Chemical Bonding and Molecular Structure

JEE Advanced 2007 · Paper 1 · Chemistry · Chemical Bonding and Molecular Structure

Among the following, the paramagnetic compound is

Among the following, the paramagnetic compound is

Options

  1. ANa2O2\mathrm{Na}_2 \mathrm{O}_2
  2. BO3\mathrm{O}_3
  3. CN2O\mathrm{N}_2 \mathrm{O}
  4. DKO2\mathrm{KO}_2

Correct answer

D. KO2\mathrm{KO}_2

Step-by-step solution

For KO2,O2−hasunpaired\mathrm{KO}_2, \mathrm{O}_2^{-} has unpairede^{-} \RightarrowparamagneticO2−: Total e−s=16+1=17σ1s2,σ∗1s2σ2s2,σ∗2s2,σ2pz2π2px1+1=π2py1+1,π∗2px1+1=π2py1paramagnetic \begin{gathered} \mathrm{O}_2^{-} \text{: Total } e^{-} s=16+1=17 \\ \sigma 1 s^2, \sigma^* 1 s^2 \sigma 2 s^2, \sigma^* 2 s^2, \sigma 2 p_z^2 \pi 2 p_x^{1+1} \\ =\pi 2 p_y^{1+1}, \pi^* 2 p_x^{1+1}=\pi 2 p_y^1 \end{gathered}
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