Which of the following statement(s) regarding molecular orbital (MO) theory is/are correct

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Pairing of electrons during the formation of a molecule is not a necessary condition unlike valence bond (VB) theory

In $C_{2}^{2 -}$ ion, the sigma bond is weaker than $π$ - bond

$L i_{2}$ molecule contain one sigma bond while $B_{2}$ molecule contain a $π$ - bond. Yet bond energy of $B_{2}$ is greater than $L i_{2}$

Both $H_{2}$ and $L i_{2}$ have one sigma bond each but the sigma bond in $H_{2}$ is stronger than in $L i_{2}$ .

answer is A, B, C, D.

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Detailed Solution

A) Pairing of electrons during the formation of a molecule is not necessary unlike VB theory as in $O_{2}, B_{2}$ , etc.,
B) Since $σ$ bonding molecular orbitals have higher energy in $C_{2}^{2 -}$ ion than $π$ - molecular bonding orbitals, sigma bond is weaker than $π$ - bond.
C) Since boron atoms are smaller than lithium atoms the single bond energy of $B_{2}$ molecule is greater than in $L i_{2}$ molecule
D) Bond energy of $H_{2}$ is more than $L i_{2}$ due to small size of H – atom.