JEE Main 2019ChemistryChemical Bonding and Molecular StructureMediumMCQ

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

JEE Main 2019 (10 Apr Shift 1)

Question

During the change of O2 to O2- , the incoming electron goes to the orbital:

Choose an option

Show full solutionCorrect option: B
Correct answer
Bπ* 2px

Step-by-step explanation

Molecular orbital configuration of O2 ( 16 electrons) σ1s2, σ* 1s2, σ2s2, σ*2s2, σ2pz2, π2px2=π2py2, π*2px2=π*2py1
When an electron is added, it enters the π*2px orbital and the configuration becomes σ1s2, σ*1s2, σ2s2, σ*2s2, σ2pz2, π2px2=π2py2, π*2px2=π*2py1

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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.