Give the difference between intermolecular hydrogen bond and intramolecular hydrogen bond.

(A) The differences between intermolecular and intramolecular hydrogen bonds are as follows:
| Feature | Intermolecular Hydrogen Bond | Intramolecular Hydrogen Bond |
| :--- | :--- | :--- |
| Definition | It is formed between two different molecules of the same or different compounds. | It is formed when a hydrogen atom is between two highly electronegative atoms present within the same molecule. |
| Example | Liquid $HF$ | $o$-Nitrophenol |
| Effect on physical properties | It increases the boiling point and melting point of the substance. | It has a lesser effect on physical properties compared to intermolecular hydrogen bonding. |
| Structural aspect | It leads to association of molecules. | It leads to chelation (ring formation) within the molecule. |