Tocopherols are the derivatives of: (A) Isoprenoid ring, (B) Tocol, (C) Sterol, (D) Ribitol
Answer is B. Active vitamine E was isolated from wheat germ oil and named tocopherolA chromane ring(tocol) system with an isoprenoid side chain is present in all naturally occurring tocopherols.Vitamine K is naphthoquinone derivative with a long isoprenoid side chain.Reference: DM Vasudevan biochemistry page no: 460