NTA Abhyas JEE Main2020ChemistryChemical Bonding and Molecular StructurePractice
According to the molecular orbital theory Which of the following statements is incorrect? [LUMO = lowest unoccupied molecular orbital]
Options
- ALUMO level for C 2 molecule is σ 2 p x orbital.
- BIn C 2 molecules both the bonds π are bonds
- CIn C 2 2 - ion there is one σ and two π bonds
- DC 2 is paramagnetic but C 2 2 - is diamagnetic.
Correct answer
D. C 2 is paramagnetic but C 2 2 - is diamagnetic.
Step-by-step solution
C 2 = σ 1 s 2 < σ * 1 s 2 < σ 2 s 2 < σ * 2 s 2 < π 2 p y 2 = π 2 p y 2 HOMO < σ 2 p x o LUMO , all electrons are paired so diamagnetic.