MCAT Organic Chemistry Question 10: Answer and Explanation
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Question: 10
10. What is the IUPAC name for the following structure?
- A. 4-isopropyl-2-methylhexane
- B. 3-isopropyl-5-methylhexane
- C. 2,2,5-trimethyl-3-ethylhexane
- D. 3-ethyl-2,2,5-trimethylhexane
Correct Answer: D
Explanation:
We begin by finding the longest carbon chain; because there are no non-alkyl groups, we don’t need to worry about any other groups’ priorities. We then number our carbons such that the lowest possible combination of numbers is given to the various substituents. Then substituents are organized alphabetically, not numerically—eliminating choice (C).