Which pair of molecules has different hybridisation but the same shape?

The shape of the $C_2H_4$ (ethene) molecule is.......

Which of the following species has a regular tetrahedral structure?

The maximum number of $90^{\circ}$ angles between bond pair-bond pair of electrons is observed in

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 $Y$.

What is the hybridisation of $Be$ in $BeF_2$ molecule?