JEE Main 2014ChemistryChemical Bonding and Molecular StructureEasyMCQ

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

JEE Main 2014 (09 Apr Online)

Question

Which of the following has unpaired electron(s)?

Choose an option

Show full solutionCorrect option: A
Correct answer
A O 2 -

Step-by-step explanation

The Molecular orbital electronic configurations are

O 2 − ⇒σ1 s 2 < σ * 1 s 2 <σ2 s 2 < σ * 2 s 2 <σ2 p z 2 <π2 p x 2 =π2 p y 2 < π * 2 p x 2 = π * 2 p y 1   (unpaired electron)

N 2 2+ ⇒σ1 s 2 < σ * 1 s 2 <σ2 s 2 < σ * 2 s 2 <π2 p x 2 =π2 p y 2 <σ2 p z 0

O 2 2− ⇒σ1 s 2 < σ * 1 s 2 <σ2 s 2 < σ * 2 s 2 <σ2 p z 2 <π2 p x 2 =π2 p y 2 < π * 2 p x 2 = π * 2 p y 2

N 2 ⇒σ1 s 2 < σ * 1 s 2 <σ2 s 2 < σ * 2 s 2 <π2 p x 2 =π2 p y 2 <σ2 p z 2
 

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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.