MCAT Organic Chemistry Question 172: Answer and Explanation
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Question: 172
7. Suppose an extraction with methylene chloride 
is performed, with the desired compound initially in brine 
In a separatory funnel, which layer will be the organic layer?
- A. Top layer
- B. Bottom layer
- C. No layers are observed; methylene chloride and brine are completely miscible.
- D. More information is needed to answer the question.
Correct Answer: B
Explanation:
Because methylene chloride is denser than brine (salt water), the organic layer will settle at the bottom of the funnel. Methylene chloride is nonpolar, so it cannot mix with brine, eliminating choice (C).