Organic chemistry is a branch of chemical science that studies hydrocarbons — substances containing carbon and hydrogen, as well as various derivatives of these compounds, including oxygen, nitrogen, and halogen atoms. All such compounds are called organic. Organic chemistry originated in the process of studying those substances that were extracted from plant and animal organisms, consisting mainly of organic compounds.

Theory of Organic Chemistry:
- Hydrocarbons
- Methane
- Ethylene
- Acetylene hydrocarbons
- Chemical properties of hydrocarbons
- Diene hydrocarbons
- Polymers
- Benzene
- Properties of acetylene
- Methods for producing benzene, toluene, ethylbenzene, styrene
- Formula limiting hydrocarbon
- Types of isomerism
- Ethanol
- Phenol
- Mutual influence of hydroxy groups in polyhydric alcohols
- Tertiary alcohol
- Acetic aldehyde
- Electronic structure of the carboxyl group
- Acetic acid
- Formic acid chemical properties
- Fat
- Glucose
- Starch and fiber (cellulose)
- Amines. Structure. Chemical properties
- Diethylamine, aniline, ammonia, egylamine, methylamine, diphenylamine
- Amino acids
- Organic compounds with dual chemical functions
- squirrels
- Denaturation of protein
- The role of hydrogen bonds in the construction of a protein molecule
- Heterocyclic compounds
- Basic chemical properties of pyrrole
- Nucleic acids. Nucleotides
- Structural formulas of nucleic acid bases of nitrogen, purine derivatives
- Structural formulas of carbohydrates that are part of nucleic acids
- General scheme of hydrolysis of nucleic acids (NC)
- Types of nucleic acids