In which of the following pairs do both the species have $sp^{3}$ hybridization?

Consider the following statements for $\dot{CH_3} = X$ and $\dot{CF_3} = Y$:
$I$. When $X$ dimerises,the bond angle decreases.
$II$. When $X$ dimerises,the bond angle increases.
$III$. In the $X-Y$ molecule,the $C-C$ bond length is less than that in the $Y-Y$ molecule.
$IV$. The bond angle in $X$ is greater than that in $Y$.

Find the hybridisation of the $C_1$,$C_2$,and $C_3$ labelled carbon atoms in the given molecule: $H-C \equiv C_1-C_2H-C_3H=CH_2$

In allene $(C_3H_4)$,the type of hybridization of the carbon atoms is (are)

Describe the change in hybridisation (if any) of the $Al$ atom in the following reaction.
$AlCl_{3} + Cl^{-} \longrightarrow AlCl_{4}^{-}$

On the transformation $PCl_5 \to PCl_6^-$,what changes will take place?