Here is a classification of organic compounds for Class 12:br br I. Hydrocarbonsbr br - Alkanes (saturated)br - Alkenes (unsaturated)br - Alkynes (unsaturated)br - Aromatic hydrocarbonsbr br II. Functional Groupsbr br - Haloalkanes (halogenated)br - Alcoholsbr - Phenolsbr - Ethersbr - Aldehydesbr - Ketonesbr - Carboxylic acidsbr - Estersbr - Aminesbr - Amidesbr br III. Organic Compounds with Specific Functional Groupsbr br - Aldehydes and Ketonesbr - Carboxylic Acids and their Derivativesbr - Amines and their Derivativesbr br IV. Biomoleculesbr br - Carbohydratesbr - Proteinsbr - Lipidsbr - Nucleic Acidsbr br V. Polymersbr br - Natural Polymers (cellulose, proteins)br - Synthetic Polymers (polyethylene, polypropylene)br br VI.