The $P-P-P$ bond angle in $P_4$ and $S-S-S$ bond angle in cyclo $S_8$ molecule are respectively

Which of the following statements is true?

In the trimer form of sulphur trioxide $(S_3O_9)$,each sulphur atom is bonded with:

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

What are the successes and failures of the Lewis theory in explaining chemical bonding?

The option$(s)$ in which at least three molecules follow the Octet Rule is(are):
$(A)$ $CO_2, C_2H_4, NO$ and $HCl$
$(B)$ $NO_2, O_3, HCl$ and $H_2SO_4$
$(C)$ $BCl_3, NO, NO_2$ and $H_2SO_4$
$(D)$ $CO_2, BCl_3, O_3$ and $C_2H_4$