JEE Main 2019ChemistryChemical Bonding and Molecular StructureMediumMCQ

JEE Main 2019 — Chemical Bonding and Molecular Structure Question with Solution

JEE Main 2019 (09 Apr Shift 2)

Question

Among the following species, the diamagnetic molecule is:

Choose an option

Show full solutionCorrect option: A
Correct answer
ACO

Step-by-step explanation

(1) B2(10)⇒σ1s2, σ*1s2, σ2s2,σ*2s2,π2px1=π2py1 , paramagnetic
(2) NO15⇒σ1s2σ*1s2σ*2s2σ2pz2π2px2=π2py2=π*2px1 , paramagnetic
(3) O216⇒ σ1s2σ*1s2σ2s2σ*2pz2π2px2=π2py2π*2px1=π*2py, paramagnetic
(4) CO14⇒  σ1s2σ*1s2,σ2s2,σ*2s2,πpx2=π2py2,σ2pz2, diamagnetic (No unpaired electron)

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About this question

This is a previous-year question from JEE Main 2019, 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.