Which of the following molecules is an example of $sp$ hybridization?

Which of the following molecules has a central atom with $sp^2$ hybridization?

Write the bond angle and hybridization type of the water molecule.

Explain the bond formation by $sp$ orbitals.

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 $Y$.

In allene $(C_3H_4)$,the type$(s)$ of hybridisation of the carbon atoms is (are):