The molecules which does not obey octet rule are

In a molecule,  the sum of valence electrons of  all atoms is equal to

8 then it is said to be an octet. The molecules which obey octet rule

they have high stability.

   

                                    ${\text{For S, SO}}_2\to 4\left(2\right)+1\left(2\right)=10e^{-}$

${\text{For P, PCl}}_5\to 5\left(2\right)=10e^{-}$     ${\text{For Sin SF}}_6\to 6\left(2\right)=12e^{-}$