Generally `H_2 O` exists as a liquid due to intermolecular hydrogen bonding.

Define intermolecular hydrogen bonding.

Statement-I: Unlike the gtC=O group of aldehydes and ketones, the C=O of R-overset(O)overset(||)C-OH does not undergo nucleophilic addition reactions. Because Statement-II: Carboxylic acids exist as dimers due to intermolecular hydrogen bonding in aprotic medium.

In solid hydrogen, the intermolecular bonding is

What are intermolecular hydrogen bonds? Explain with example.