Multiple choice general knowledge science & technology Riboflavin is a chemical name of.... B1 B2 B3 B5 Reveal answer Fill a bubble to check yourself B Correct answer Explanation Riboflavin is the scientific name for Vitamin B2. Vitamin B1 is Thiamine, B3 is Niacin, and B5 is Pantothenic acid. The B-complex vitamins each have distinct chemical names that are important to know.