Answer:
D. Dehydrogenation.
Step-by-step explanation:
Let's review the concepts of each reaction of the group of answer choices:
- Reduction occurs when a substance gains electrons.
- Hydration is a chemical reaction when a substance is combined with water.
- Dehydration is the opposite of hydration. It is the chemical reaction when water is removed from a substance.
- Dehydrogenation is the reaction when we remove hydrogen from a substance.
In this case, the statement is telling us that we're removing hydrogen from ethylbenzene to produce styrene:
You can identify that H2 (hydrogen) is being removed, so the answer would be D. Dehydrogenation.
* This can be confused with dehydration, but instead of H2, for dehydration, it would be H2O, which is water.