Questions: Which of the following ^1H NMR signals would the NMR spectrum of this molecule show? 3 H signal at 7-8 ppm 3 H signal at 3-4 ppm 1 H signal at 9-10 ppm

Which of the following ^1H NMR signals would the NMR spectrum of this molecule show? 3 H signal at 7-8 ppm 3 H signal at 3-4 ppm 1 H signal at 9-10 ppm
Transcript text: 7 2 points Which of the following ${ }^{1}$ H NMR signals would the NMR spectrum of this molecule show? 3 H signal at $7-8 \mathrm{ppm}$ 3 H signal at 3-4 ppm 1 H signal at $9-10 \mathrm{ppm}$
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Solution

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Solution Steps

Step 1: Identify the molecule

The molecule shown is methyl acetoacetate, which has the structure CH3COCH2COOCH3.

Step 2: Analyze the proton environments
  • The molecule has several distinct proton environments:
    • The CH3 group attached to the carbonyl (C=O) group.
    • The CH2 group between the two carbonyl groups.
    • The CH3 group attached to the ester oxygen (OCH3).
Step 3: Determine the chemical shifts
  • The CH3 group attached to the carbonyl (C=O) group typically appears around 2-2.5 ppm.
  • The CH2 group between the two carbonyl groups typically appears around 3-4 ppm.
  • The CH3 group attached to the ester oxygen (OCH3) typically appears around 3-4 ppm.

Final Answer

The 3H signal at 3-4 ppm corresponds to the CH3 group attached to the ester oxygen (OCH3). Therefore, the correct answer is the second option: "3H signal at 3-4 ppm."

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