Which of the following vitamin is called 'Tocopherol's?

Vitamin E is called 'Tocopherol's.
Vitamin E is a group of eight fat-soluble compounds that include four tocopherols and four tocotrienols. Vitamin E is a fat-soluble antioxidant which may help protect cell membranes from reactive oxygen species.
Vitamin E was discovered in 1922, isolated in 1935, and first synthesized in 1938. Because the vitamin activity was first identified as essential for fertilized eggs to result in live births (in rats), it was given the name "tocopherol" from Greek words meaning birth and to bear or carry.