An addition reaction typically yields what?

• A. Two products formed
• B. A single product formed
• C. No product formed
• D. A reversible equilibrium

Answer: (B)

An addition reaction adds two atoms or groups across a double bond, breaking the pi bond and forming two new sigma bonds to give a saturated product. Because the two reacting pieces become part of one molecule, the process typically produces one main product. For example, H2 adding to an alkene gives a single saturated hydrocarbon, and halogenation of an alkene also yields one main adduct. If a new chiral center is created, you may get stereoisomers, but these are considered variations of the same product rather than separate products formed in the reaction’s basic sense.