JEE Advanced2016ChemistryChemical Bonding and Molecular StructureActual
According to Molecular Orbital Theory,
Options
- AC 2 2 - is expected to be diamagnetic
- BO 2 2 + is expected to have a longer bond length than O 2
- CN 2 + and N 2 - have the same bond order
- DH e 2 + has the same energy as two isolated He atoms
Correct answer
A. C 2 2 - is expected to be diamagnetic
Step-by-step solution
A] The molecular orbital energy configuration of C 2 2 - is σ 1 s 2 ,   σ 1 s * 2 ,   σ 2 s 2 ,   σ 2 s * 2 ,   π 2 p x 2 = π 2 p y 2   ,   σ 2 p z 2 In the MO of C 2 2 - there is no unpaired electron hence it is diamagnetic B] Bond order of O 2 2 + is 3 and O 2 is 2 therefore bond length of O 2 is greater than O 2 2 + C] The molecular orbital energy configuration of N 2 + is σ 1 s 2 ,   σ 1 s * 2 ,   σ 2 s 2 ,   σ 2