Home ยป Niacin or nicotinic acid is a monocarboxylic acid derivative of Vitamins MCQs Niacin or nicotinic acid is a monocarboxylic acid derivative of January 26, 2022 16 Views Q. Niacin or nicotinic acid is a monocarboxylic acid derivative of A. Pyridine B. Pyrimidine C. Flavin D. Adenine Answer: Pyridine