Give $\mathrm{MO}$ diagram and explain $\mathrm{Ne}_{2}$ molecule is not possible.

For $F_2$ and $OF$ molecules consider the following statements 
$(a)$ Bond order for both is one
$(b)$ $OF$ is paramagnetic but $F_2$ is diamagnetic
$(c)$ $F_2$ is more likely to dissociate into atoms than $OF$
$(d)$ Both have greater number of electrons in $BMO$ than that in $ABMO$
Which of the following statements are true $(T)$ or false $(F)$ respectively

According to $MO$ theory, number of species/ions from the following having identical bond order is $………$

$CN ^{-}, NO ^{+}, O _{2}, O _{2}^{+}, O _{2}^{2+}$

The number and type of bonds in $C_2^{2 – }$ ion in $CaC_2$ are

Give electron configuration, bond order magnetic property and energy diagram for Lithium $\left( {{\rm{L}}{{\rm{i}}_2}} \right)$ molecule.