Hydrogen bonding does not play a central role in the following phenomena:

Which concept best explains that $o-$nitrophenol is more volatile than $p-$nitrophenol?

Which among the following attractions is the strongest?

At room temperature $H_2O$ is a liquid while $H_2S$ is a gas. The reason is

Consider the following statements:
$I.$ In gaseous phase,the vapour pressure of $CH_3COOH$ is less than expected.
$II.$ In benzene,acetic acid dimerises.
$III.$ $CH_3OH$ is more viscous than $H_2O$.
$IV.$ $CH_3OCH_3$ is non-polar but soluble in water.
Select the correct set of codes using $T$ for true and $F$ for false statements in the given sequence.

The crystal lattice of ice is mostly formed by