Chapter 98 of 2363 min read
Molecular orbital theory
Why this is asked: MOT's headline NEET question is O₂'s paramagnetism — two unpaired electrons in its degenerate π*2p orbitals, which the paired-electron double-bond picture from Lewis structures or VBT can't show at all. Watch the filling order too: from Li₂ to N₂, σ2p fills after π2p (s–p mixing pushes it up); from O₂ onward σ2p drops back below π2p.
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- •Given below are two statements: Statement I: A hypothetical diatomic molecule with bond order zero is quite stable. Statement II: As bond order increases, the bond length increases. In the light of the above statements, choose the most appropriate answer from the options given below:
- •Match List I with List II.
Choose the correct answer from the options given below:List I (Molecule) List II (Number and type of bonds between two carbon atoms) A. ethane I. one bond and two bonds B. ethene II. two bonds C. carbon molecule, III. one bond D. ethyne IV. one bond and one bond
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