Answer:
Polyunsaturated compounds or the polyunsaturated fatty acids are the type of unsaturated fatty acids containing two or more than two carbon-carbon double bonds.
They can be classified into three groups on the basis of their chemical structure:
1. Methylene-interrupted polyenes: contain more than one cis double bonds which are separated by a methylene group. Example: Linoleic acid
2. Conjugated fatty acids: contain at least one double pair which is separated by a single bond. Example: Punicic acid
3. Other polyunsaturated fatty acids. Example: Pinolenic acid
