The crystal lattice of ice is mostly formed by

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

The difference in the $B.P.$ of $H_2O$ $(100 \ ^oC)$ and $H_2S$ $(-42 \ ^oC)$ is explained by:

Which compound forms a linear polymer due to $H$-bonding?

Intramolecular hydrogen bonding is present in

Viscosity of a liquid arises due to strong intermolecular forces existing between the molecules. Stronger the intermolecular forces,greater is the viscosity. Name the intermolecular forces existing in the following liquids and arrange them in the increasing order of their viscosities. Also give reason for the assigned order in one line.
Water,hexane $(CH_3CH_2CH_2CH_2CH_2CH_3)$,glycerine $(CH_2OHCH(OH)CH_2OH)$