Question

What is the correct IUPAC name of following compound?

• A. 5-bromo-6-chloro-8-hydroxy-8-methylnon-4,6-dien-2-ynedioic acid
• B. 5-bromo-6-chloro-8-hydroxy-8-methylnona-4,6-dien-2-ynedioic acid
• C. 5-bromo-4-chloro-2-hydroxy-2-methylnona-4,6-dien-2-ynedioic acid
• D. 5-bromo-4-chloro-2-hydroxy-2-methylnon-4,6-diene-2-ynedioic acid

Answer 1

The correct option is B 5-bromo-6-chloro-8-hydroxy-8-methylnona-4,6-dien-2-ynedioic acid



Here, hydroxy does not get the number 2 because it is treated as a substituent after numbering the main chain, so preference goes to the triple bond. So the name given is 5-bromo-6-chloro-8-hydroxy-8-methylnona-4,6-dien-2-ynedioic acid.