The compound/s which will show significant intermolecular H-bonding is/are:

Intermolecular hydrogen bonding is the hydrogen bonding that occurs between different molecules due to the attraction between H attached to highly electronegative atoms (O, N, F) and lone pairs present on another molecule.

(a) shows intramolecular hydrogen bonding because the -OH group and -NO₂ group are present at ortho positions, allowing H-bonding within the same molecule.

Hence, (a) does not show significant intermolecular H-bonding.

(b) contains both -OH and -NH groups and can form strong hydrogen bonding between different molecules.

Hence, (b) shows significant intermolecular hydrogen bonding.

(c) is a sterically hindered phenol due to bulky groups near the -OH group, preventing effective intermolecular H-bonding.

Hence, (c) does not show significant intermolecular hydrogen bonding.

Therefore, the correct answer is:

$$\boxed{(b)}$$