State the number of expected 1H NMR signals AND their integral ratio for the following structure: CH3CH2COCH2CH3Group of answer choices2 signals is a 6:4 ratio4 signals is a 3:2:2:3 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 choices2 signals is a 6:4 ratio4 signals is a 3:2:2:3 ratio2 signals is a 3:2 ratio
Solution
The molecule CH3CH2COCH2CH3 is a five-carbon chain with a carbonyl group in the middle.
There are four different types of hydrogen environments in this molecule:
- The three hydrogen atoms in the terminal -CH3 group on the left (CH3CH2-).
- The two hydrogen atoms in the -CH2- group next to the carbonyl group (-CH2CO-).
- The two hydrogen atoms in the -CH2- group next to the carbonyl group on the other side (-COCH2-).
- The three hydrogen atoms in the terminal -CH3 group on the right (-CH2CH3).
So, we would expect to see 4 signals in the 1H NMR spectrum.
The integral ratio (which represents the relative number of protons giving rise to each signal) would be 3:2:2:3, corresponding to the four types of hydrogen environments listed above.
So, the correct answer is "4 signals is a 3:2:2:3 ratio".
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