In which of the following is the strongest hydrogen bonding observed?

The pair likely to form the strongest hydrogen bonding 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.

Which of the following is the correct order of increasing enthalpy of vaporization for the given hydrides?

Which is the weakest among the following types of bond?

Hydrogen bonding does not play any role in the boiling of