Final answer:
Vitamin E refers to a group of compounds called tocopherols and tocotrienols, known for their strong antioxidant properties in the body.
Step-by-step explanation:
The vitamin that refers to a group of compounds called tocopherols and tocotrienols is Vitamin E. Vitamin E serves as an important antioxidant in the body, scavenging harmful by-products of metabolism like free radicals. These properties of Vitamin E, particularly attributed to tocopherols, are crucial in preventing the oxidation of lipids and fats in the body and other vitamins like Vitamin A. The chemical structure of Vitamin E includes a characteristic double ring structure called the chromane ring, which is fundamental to its antioxidant activity. In contrast to Vitamin E, the water-soluble vitamin from the choices given is Vitamin C, which is also known for its antioxidant properties.