Which of the following does not obey the octet rule?

How many $S-S$ bonds,$S-O-S$ bonds,$\sigma$-bonds,and $\pi$-bonds are present in the trimer of sulphur trioxide $(S_3O_9)$?

Identify the correct statement$(s)$ from the following:
$a$) Dipole moment of $NH_3$ is more than $NF_3$
$b$) $SF_4$ is square planar
$c$) $SnCl_4$ is more covalent than $SnCl_2$
$d$) $In_2SO_4$ sulphur atom has expanded octet

Which of the following cations is the most stable?

The oxidation state $(n)$, coordination number $(CN)$ of $Al$, and the number of valence electrons around $Al$ $(N)$ in $Al_2Cl_6$ are respectively:

The shapes of $BCl_3, PCl_3$ and $ICl_3$ molecules are all