AP | A-Level | IB | NCERT 11 + 12 – FREE NOTES, RESOURCES AND VIDEOS!
1 Solutions 2 Electrochemistry 3 Chemical Kinetics 4 The d-and f-Block Elements 5 Coordination Compounds 6 Haloalkanes and Haloarenes 7 Alcohols, Phenols and Ethers 8 Aldehydes, Ketones and Carboxylic Acids 9 Amines 10 Biomolecules

9 Amines

9.1 Structure of Amines 9.2 Classification 9.3 Nomenclature 9.4 Preparation of Amines 9.5 Physical Properties 9.6 Chemical Reactions 9.7 Method of Preparation of Diazonium Salts 9.8 Physical Properties of Diazonium Salts 9.9 Chemical Reactions of Diazonium Salts 9.10 Importance of Diazonium Salts in Synthesis of Aromatic Compounds

Physical Properties of Diazonium Salts

NCERT Reference: Chapter 9 – Amines – Page 251

Quick Notes

  • Benzenediazonium chloride is a colourless crystalline solid.
  • Soluble in water and stable in cold aqueous solution.
  • Decomposes readily when warmed or in the dry state.
  • Benzenediazonium fluoroborate is insoluble in water and more stable, can be stored.

Full Notes

Diazonium salts, though widely used in organic synthesis, are thermally sensitive and must be handled with care. Their physical properties influence how they are used and stored in laboratory conditions.

Physical State and Appearance

Solubility

Thermal Stability

Stability of Fluoroborate Salts

Key Point

The physical instability of most diazonium salts underlines their role as intermediates, not shelf-stable reagents. Their solubility and sensitivity require controlled conditions for use, particularly cold temperatures and aqueous environments.

Summary