Intramolecular hydrogen bonding is present in:

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1. **Definition:** Hydrogen bonds can be of two types: intermolecular and intramolecular.
2. **Intramolecular Hydrogen Bond:** This type of bond is formed when a hydrogen atom lies in between two highly electronegative atoms (F, O, N) present within the **same molecule**.
3. **Specific Example:** NCERT explicitly cites **o-Nitrophenol** as an example of intramolecular hydrogen bonding. In this molecule, the hydrogen of the hydroxyl group (-OH) forms a bond with one of the oxygen atoms of the nitro group (-NO$$_2$$) located at the ortho position .
4. **Comparison:** HF (Hydrogen Fluoride) exhibits **intermolecular** hydrogen bonding, where bonds form between different molecules .

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