Final answer:
C4H6, C3H6, and C4H8 undergo additional reactions, while C4H8 undergoes a substitutional reaction.
Step-by-step explanation:
The compounds C4H6, C3H6, and C4H8 will undergo additional reactions. In additional reactions, new atoms or groups of atoms are added to the compound without replacing any existing atoms. These reactions occur when there are multiple bonds in the compound.
The compounds C4H6 and C3H6 have multiple bonds (double bond), making them prone to additional reactions. For example, C3H6 can undergo addition reactions with hydrogen gas and form C3H8. On the other hand, C4H8 does not have any multiple bonds, so it will undergo substitutional reactions.