Choose the correct code of characteristics for the given order of hybrid orbitals of the same atom,$sp < sp^2 < sp^3$:
$(i)$ Electronegativity
$(ii)$ Bond angle between same hybrid orbitals
$(iii)$ Size
$(iv)$ Energy level

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 $Y$.

The correct order regarding the electronegativity of hybrid orbitals of carbon is

$NH_2CONH_2 + 2 H_2O \rightarrow [X] \rightleftharpoons 2 NH_3 + H_2O + [Y]$
The hybridization of carbon in $X$ and $Y$ respectively are

Which of the following hybrid orbitals is used by the chlorine atom in the $ClO_2^-$ ion?

What is the bond angle observed in the $H-C-H$ bond of ethane (in $^{\circ}$)?