What is the name of a reaction in which electrons are transferred from one atom to another?

A combustion reaction is a specific type of exothermic reaction where a substance combines with oxygen, producing energy in the form of heat and light. While combustion reactions may involve electron transfer, they are characterized primarily by the reaction of a fuel with an oxidizer, not the general electron transfer between atoms.

A synthesis reaction refers to a type of reaction where two or more simple substances combine to form a more complex substance. This process does not inherently involve the transfer of electrons but rather the formation of new bonds. Therefore, it does not qualify as a reaction defined by electron transfer.

A double-displacement reaction, also known as a metathesis reaction, involves the exchange of partners between two compounds, typically producing a precipitate, gas, or water. This type of reaction does not involve the transfer of electrons but rather the swapping of ions or molecules, hence it does not fit the definition of the question.