Which statement correctly describes an addition reaction?
Two substances combine to form one product
In an addition reaction, a molecule adds across a double or triple bond of an unsaturated compound, and the reactants join together to give a single product. Nothing is removed or left over.
For example, ethene reacts with hydrogen in the presence of a nickel catalyst: CH2=CH2 + H2 → CH3–CH3. Two substances (ethene and hydrogen) combine to form one product (ethane). The hydrogenation of vegetable oils works in the same way.
One atom replacing another in a compound is a substitution reaction (for example, chlorine replacing hydrogen in methane). A compound splitting into two products is a decomposition reaction, and a solid forming from two solutions is a precipitation reaction.
Hence, Two substances combine to form one product.
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