MCAT Organic Chemistry Question 11: Answer and Explanation

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Question: 11

11. The IUPAC name for the following structure starts with what prefix?

  • A. 3-methyl-
  • B. 2-methyl-
  • C. 2-hydroxy-
  • D. 3-hydroxy-

Correct Answer: B

Explanation:

We know right away that choices (C) and (D) will be incorrect because a hydroxyl group is of higher priority than a methyl group. We also know that we will number the carbon chain so that the hydroxyl group receives the lowest possible position. Therefore, this molecule is 2-methyl-2-butanol, which starts with the prefix 2-methyl.

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