JEE Main 2017ChemistryChemical Bonding and Molecular StructureMediumMCQ

JEE Main 2017 — Chemical Bonding and Molecular Structure Question with Solution

JEE Main 2017 (02 Apr)

Question

Which of the following species is not paramagnetic?

Choose an option

Show full solutionCorrect option: A
Correct answer
ACO

Step-by-step explanation

CO has no unpaired electron while  other have unpaired electrons so, paramagnetic in nature.(Apply M.O.T)

Molecular orbital configuration⇒

CO :like N2 ; σ1s2<σ*1S2<σ2S2<σ*2S2<π2Px2= π2Py2<σ2Pz2  (No unpaired electrons)

O2 :σ1S2<σ*1S2<σ2S2<σ*2S2<σ2Pz2<π2Px2=π2Py2<π*2Px1= π*2Py1  (2unpaired electrons)

B2:σ1S2<σ*1S2<σ2S2<σ*2S2<π2Px1=π2Py1 (2unpaired electrons)

NO : σ1S2<σ*1S2<σ2S2<σ*2S2<σ2Pz2<π2Px2=π2Py2<π*2Py1= π*2Px0(1unpaired electrons)

 

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About this question

This is a previous-year question from JEE Main 2017, 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.