JEE Main 2014ChemistryChemical Bonding and Molecular StructureEasyMCQ

JEE Main 2014 — Chemical Bonding and Molecular Structure Question with Solution

JEE Main 2014 (19 Apr Online)

Question

Which one of the following molecules is paramagnetic?

Choose an option

Show full solutionCorrect option: D
Correct answer
DNO

Step-by-step explanation

As per Molecular orbital theory,

N2 14 electrons all paired electrons, so diamagnetic.

N2⇒σ1s2<σ*1s2<σ2s2<σ*2s2<π2px2=π2py2<σ2pz2

O3-24 electrons and diamagnetic.​

CO 14 electrons all paired so, diamagnetic.

CO⇒σ1s2<σ*1s2<σ2s2<σ*2s2<π2px2=π2py2<σ2pz2

NO 15 electrons one unpaired electron so, paramagnetic.​

NO⇒σ1s2<σ*1s2<σ2s2<σ*2s2<π2px2=π2py2<σ2pz2<π*2px1=π*2py0
 

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About this question

This is a previous-year question from JEE Main 2014, covering the Chemical Bonding and Molecular Structure chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.