Which of the following compounds has $sp^2$ hybridization?

If $p_x$ and $p_y$ orbitals participate in $sp^2$ hybridisation of the sulphur atom in $SO_3$,then the $d$ orbitals which are used in $p\pi-d\pi$ bonds are

The percentage of $p$-character in the orbitals forming $P-P$ bonds in $P_4$ is

The percentage of $p$-character of the hybrid orbitals in graphite and diamond are respectively

Which of the following will be octahedral?

In the following molecule,determine the hybridisation of carbon atoms $a, b$ and $c$ respectively: