Which of the following compounds does not exist?

Assertion : The $S-S-S$ bond angle in $S_8$ molecule is $105^o$.
Reason : $S_8$ has a $V$-shape.

Fill in the blanks:
$(i)$ In $1927$,Heitler and London proposed the ........ theory.
$(ii)$ The ${\rm{ClF}}_3$ molecule has a .... shape.
$(iii)$ The number of bonding pairs in ions with a square planar shape is .......... .
$(iv)$ The value of the dipole moment in ${\rm{HBr}}$ is .......... .

$BX_3 + NH_3 \xrightarrow{R.T} BX_3 \cdot NH_3 + \text{Heat of adduct formation } (\Delta H)$. The numerical value of $\Delta H$ is found to be maximum for

Which of the following statement$(s)$ is/are correct?

Fill in the blanks given below:
$(i)$ The electronic configuration of noble gases is .......... .
$(ii)$ The bond formed by electrostatic attraction between a cation and an anion is called ........... .
$(iii)$ The octet rule is also known as ............ .
$(iv)$ The equilibrium distance between the centers of two bonded atoms in a molecule is called .......... .