$H.O.M.O.$ (Highest Occupied Molecular Orbital) of $CO $ molecular is

In which pair, or pairs, is the stronger bond found in the first species

$(a)$ $O_2^ - ,{O_2}$  $(b)$ ${N_2},N_2^ +$  $(c)$ $NO^+, NO^-$

According to the molecular orbital theory, the bond order in ${C_2}$ molecule is

Four diatomic species are listed below. Identify the correct order in which the bond order is increasing in them

The linear combination of atomic orbitals to form molecular orbitals takes place only when the combining atomic orbitals

$A$. have the same energy

$B$. have the minimum overlap

$C$. have same symmetry about the molecular axis

$D$. have different symmetry about the molecular axis

Choose the most appropriate from the options given below:

Number of lone pair (s) of electrons on central atom and the shape of $BrF _{3}$ molecule respectively, are ..... .