What type of reaction involves both oxidation and reduction?

• A. Synthesis reactions
• B. Redox reactions
• C. Decomposition reactions
• D. Exchange reactions

Answer: (B)

The type of reaction that involves both oxidation and reduction is known as a redox reaction. In redox reactions, electrons are transferred between reactants, leading to changes in their oxidation states. This transfer is characterized by one substance being oxidized, which means it loses electrons, and another substance being reduced, which means it gains electrons.

The hallmark of redox reactions is this interplay of oxidation and reduction, which is essential in many biological processes, such as cellular respiration and photosynthesis, as well as in various chemical processes. Other types of reactions, such as synthesis, decomposition, or exchange reactions, do not necessarily involve the transfer of electrons between reactants. Thus, redox reactions uniquely capture the essence of simultaneous oxidation and reduction processes in their mechanism.