Which of the following molecules shows intramolecular hydrogen bonding?

When two ice cubes are pressed over each other,they unite to form one cube. Which of the following forces is responsible for holding them together?

Observe the following substances: Ethanol,acetic acid,ethylamine,trimethylamine,salicylic acid,ethanal. In the above list,the number of substances with $H$-bonding is:

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 $(CH_2OHCH(OH)CH_2OH)$

The number of hydrogen bonded water molecule$(s)$ associated with $CuSO_4 \cdot 5H_2O$ is

Which of the following molecules has intramolecular hydrogen bonding?