What organisms use the energy of oxidation reactions of inorganic substances in the process of synthesizing organic compounds?

Answer: bacteria.
Bacteria are microscopic, single-celled organisms that exist in every environment, both inside and outside other organisms.
Some bacteria are harmful, but most are beneficial. They support many life forms such as plants, animals, and are used for industrial and medicinal purposes. Bacteria can be used in most organic and some inorganic compounds as food, and some can survive even in extreme conditions.