The hydrogen bonding which takes place within a molecule itself is called intramolecular hydrogen bonding. It takes place in compounds containing two groups such that one group contains a H-atom linked to an electronegative atom and other group contains a highly electronegative atom linked to a lesser electronegative atom, the bond is formed between the H-atom of one group with the more electronegative atom such as $\mathrm{F}, \mathrm{O}$ or $\mathrm{N}$ of the other group.