State the number of expected 1H NMR signals AND their integral ratio for the following structure: CH3CH2COCH2CH3Group of answer choices4 signals is a 3:2:2:3 ratio2 signals is a 6:4 ratio2 signals is a 3:2 ratio
Question
State the number of expected 1H NMR signals AND their integral ratio for the following structure: CH3CH2COCH2CH3Group of answer choices4 signals is a 3:2:2:3 ratio2 signals is a 6:4 ratio2 signals is a 3:2 ratio
Solution
The molecule CH3CH2COCH2CH3 is pentanone.
In this molecule, there are four different types of hydrogen environments:
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The three hydrogen atoms attached to the carbon atom in the -CH3 group at the end of the molecule.
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The two hydrogen atoms attached to the carbon atom in the -CH2- group that is directly attached to the carbonyl group (C=O).
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The two hydrogen atoms attached to the carbon atom in the -CH2- group that is directly attached to the -CH3 group.
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The three hydrogen atoms attached to the carbon atom in the -CH3 group at the other end of the molecule.
The integral ratio corresponds to the number of protons in each environment. So, the integral ratio would be 3:2:2:3.
So, the correct answer is: 4 signals in a 3:2:2:3 ratio.
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