What is substitution reaction? Md. Saifur Rahman The reaction in which a more reactive element replaces less reactive elements to form a new compound is called substitution reaction.You may likeDo I need car insurance?What is car insurance?How could I get cheaper car insurance?What is auto insurance?Why Adulterant food is the barrier to sound health?What are the producers?What are food preservatives?What is food chain?What is tertiary consumer?