In methane,the bond angle is $......^o$.

For which of the following hybridisation is the bond angle maximum?

Identify the molecule from the following that does $NOT$ involve $sp^3$ hybridisation.

Which compound does not possess linear geometry?

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 $Y$.

From left to right, $sp^2, sp^2, sp, sp$ hybridisation is present in