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Question

What is the correct IUPAC name of following compound?

  1. 5-bromo-6-chloro-8-hydroxy-8-methylnon-4,6-dien-2-ynedioic acid
  2. 5-bromo-6-chloro-8-hydroxy-8-methylnona-4,6-dien-2-ynedioic acid
  3. 5-bromo-4-chloro-2-hydroxy-2-methylnon-4,6-diene-2-ynedioic acid
  4. 5-bromo-4-chloro-2-hydroxy-2-methylnona-4,6-dien-2-ynedioic acid


Solution

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.

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