Sulphuric acid $(H_2SO_4)$ provides an example of:

The number of molecules or ions from the following,which do not have an odd number of electrons are $...............$.
$A. NO_2$ $B. ICl_4^{-}$ $C. BrF_3$ $D. ClO_2$ $E. NO_2^{+}$ $F. NO$

Pick out the isoelectronic structures from the following:
$\mathop {CH_3^+}\limits_{I}$ $\mathop {H_3O^{+}}\limits_{II}$ $\mathop {NH_3}\limits_{III}$ $\mathop {CH_3^-}\limits_{IV}$

Find the correct option regarding the given chemical properties.

In which of the following pairs of species is the bond length as well as the bond energy of the $I^{st}$ species less than the $II^{nd}$ species?

Compare $\pi$-bond strength between $B$ and $N$ in the following compounds: $(I)$ $((CH_3)_3Si)_2N^{-}BH_2$ and $(II)$ $((CH_3)_3C)_2N^{-}BH_2$.