The four groups of organic compounds found in living things are carbohydrates, lipids (fats), nucleic acids, and proteins.
Carbohydrates:
Carbohydrates are the compounds made of carbon, hydrogen, and oxygen. They are present in 1:2:1 ratio. They are the main source of energy. Carbohydrates are the structural component of plants and animals. They are being classified depending upon the type and number of sugars present.
Lipids:
Lipids are derived from carbon and hydrogen. They are classified into oils, waxes, and fats. They are the abundant store of energy. They are the component of biological membrane.
Nucleic acids:
Nucleic acids are made up of carbon, hydrogen, oxygen, nitrogen, and phosphorous. They are made from nucleotides. They are responsible in transmitting genetic information.
Proteins:
They are made up of carbon, hydrogen, and oxygen. The monomeric units of proteins are amino acids, with amino group and carboxyl group on either ends. They regulate the rate of reactions.