Hydrogen Bonding

Intramolecular hydrogen bonding occurs when a hydrogen atom forms a bond with an electronegative atom within the same molecule.
In o-nitrophenol, the and groups are present in ortho positions, allowing the formation of a hydrogen bond within the molecule.
Other options:
- HF → forms intermolecular H-bonding
- CH OH → also shows intermolecular H-bonding
- o-Cresol → primarily forms intermolecular H-bonds

Hydrides are classified as:
- Ionic hydrides → with metals (e.g., NaH)
- Covalent/molecular hydrides → with p-block elements (e.g., B H )
- Metallic hydrides → transition elements (e.g., CrH)
Out of the given:
- B H (Diborane) is a typical molecular hydride
- BeH is polymeric
- NaH is ionic
- CrH is metallic