Which of the following is always true about a synthesis reaction?
a. One product is formed.
b. There is only one reactant.
c. The general formula is C - > A +
b. d. A product might be a compound, or it might be an element.
The correct answer is option A. A synthesis reaction is where only one product is being formed. This reaction can have many reactants but it must be that the product should only be single. This type of reaction releases energy mostly in the form of heat or light therefore it is an exothermic reaction.
