Delocalised molecular orbitals are found in

What will be the resonance energy of $N_2O$ from the following data: $\Delta H_f(N_2O) = 82 \ kJ \ mol^{-1}$. Bond energies of $N \equiv N$,$N = N$,$O = O$,and $N = O$ bonds are $946$,$418$,$498$,and $607 \ kJ \ mol^{-1}$ respectively.

The correct bond order of the $B-F$ bond in the $BF_3$ molecule is:

Why is benzene extraordinarily stable though it contains three double bonds?

The most stable resonating structure of $CH_3-O^{-}-CH=CH_2$ is

$H - N\mathop { - - - }\limits^{(I)} N\mathop { - - - }\limits^{(II)} N$
In hydrogen azide,the bond orders of bonds $(I)$ and $(II)$ are . . . . . .