During change of O2 to O+2O2 to O2+ ion, the electron is removed from which one of the following orbitals?Only one correct answerA.π* orbitalB.π orbitalC.σ* orbitalD.σ orbitalPreviousClearMark for Review & NextNextInstructionsEnglishNot VisitedNot AnsweredAnsweredMarked for ReviewAnswered & Marked for review(will be considered for evaluation)CHEMISTRYSection-ISection-II3132333435363738394041424344454647484950Test
Question
During change of O2 to O+2O2 to O2+ ion, the electron is removed from which one of the following orbitals?Only one correct answerA.π* orbitalB.π orbitalC.σ* orbitalD.σ orbitalPreviousClearMark for Review & NextNextInstructionsEnglishNot VisitedNot AnsweredAnsweredMarked for ReviewAnswered & Marked for review(will be considered for evaluation)CHEMISTRYSection-ISection-II3132333435363738394041424344454647484950Test
Solution
The electron is removed from the π* orbital. So, the correct answer is A. π* orbital.
Here's why:
Molecular oxygen (O2) has the following molecular orbital configuration: σ2s(2), σ2s(2), σ2p(2), π2p(4), π2p(2). The highest energy electrons (and therefore the ones that would be removed first) are in the π*2p orbital.
When O2 is ionized to O2+, it loses one electron. This electron is removed from the highest occupied molecular orbital, which is the π*2p orbital.
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