Using 1H NMR, what key features would be used to differentiate ethanal, ethanol and ethanoic acid?Group of answer choicesEthanoic acid would give a quartet in the 0-1.5 ppm region, a triplet in the 2.5-4 ppm region and a broad singlet somewhere in the spectrum (likely in the 1-3 ppm region)Ethanol would give a doublet in the 2-3 ppm region and a quartet in the 8-9 ppm regionEthanal would give a singlet in the 2-3 ppm region and a broad singlet somewhere in the spectrum (likely in the 10-12 ppm region)Ethanol would give a quartet in the 0-1.5 ppm region, a triplet in the 2.5-4 ppm region and a broad singlet somewhere in the spectrum (likely in the 1-3 ppm region)Ethanal would give a doublet in the 2-3 ppm region and a quartet in the 8-9 ppm regionEthanoic acid would give a singlet in the 2-3 ppm region and a broad singlet somewhere in the spectrum (likely in the 10-12 ppm region)Ethanol would give a quartet in the 0-1.5 ppm region, a triplet in the 2.5-4 ppm region and a broad singlet somewhere in the spectrum (likely in the 1-3 ppm region)Ethanoic acid would give a doublet in the 2-3 ppm region and a quartet in the 8-9 ppm regionEthanal would give a singlet in the 2-3 ppm region and a broad singlet somewhere in the spectrum (likely in the 10-12 ppm region)Ethanal would give a quartet in the 0-1.5 ppm region, a triplet in the 2.5-4 ppm region and a broad singlet somewhere in the spectrum (likely in the 1-3 ppm region)Ethanol would give a doublet in the 2-3 ppm region and a quartet in the 8-9 ppm regionEthanoic acid would give a singlet in the 2-3 ppm region and a broad singlet somewhere in the spectrum (likely in the 10-12 ppm region)
Question
Using 1H NMR, what key features would be used to differentiate ethanal, ethanol and ethanoic acid?Group of answer choicesEthanoic acid would give a quartet in the 0-1.5 ppm region, a triplet in the 2.5-4 ppm region and a broad singlet somewhere in the spectrum (likely in the 1-3 ppm region)Ethanol would give a doublet in the 2-3 ppm region and a quartet in the 8-9 ppm regionEthanal would give a singlet in the 2-3 ppm region and a broad singlet somewhere in the spectrum (likely in the 10-12 ppm region)Ethanol would give a quartet in the 0-1.5 ppm region, a triplet in the 2.5-4 ppm region and a broad singlet somewhere in the spectrum (likely in the 1-3 ppm region)Ethanal would give a doublet in the 2-3 ppm region and a quartet in the 8-9 ppm regionEthanoic acid would give a singlet in the 2-3 ppm region and a broad singlet somewhere in the spectrum (likely in the 10-12 ppm region)Ethanol would give a quartet in the 0-1.5 ppm region, a triplet in the 2.5-4 ppm region and a broad singlet somewhere in the spectrum (likely in the 1-3 ppm region)Ethanoic acid would give a doublet in the 2-3 ppm region and a quartet in the 8-9 ppm regionEthanal would give a singlet in the 2-3 ppm region and a broad singlet somewhere in the spectrum (likely in the 10-12 ppm region)Ethanal would give a quartet in the 0-1.5 ppm region, a triplet in the 2.5-4 ppm region and a broad singlet somewhere in the spectrum (likely in the 1-3 ppm region)Ethanol would give a doublet in the 2-3 ppm region and a quartet in the 8-9 ppm regionEthanoic acid would give a singlet in the 2-3 ppm region and a broad singlet somewhere in the spectrum (likely in the 10-12 ppm region)
Solution
In 1H NMR spectroscopy, the chemical shift and splitting pattern of signals can help differentiate between different types of compounds. Here's how you would differentiate ethanal, ethanol, and ethanoic acid:
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Ethanal (CH3CHO) has two types of protons: those in the -CH3 group and the one on the carbon adjacent to the carbonyl group. The -CH3 group would give a singlet in the 1-2 ppm region (typical for methyl groups), and the proton on the carbon adjacent to the carbonyl group would give a singlet in the 9-10 ppm region (typical for protons adjacent to a carbonyl group).
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Ethanol (CH3CH2OH) also has three types of protons: those in the -CH3 group, those in the -CH2- group, and the one in the -OH group. The -CH3 group would give a triplet in the 1-2 ppm region, the -CH2- group would give a quartet in the 3-4 ppm region, and the -OH proton would give a broad singlet, typically in the 2-5 ppm region, but this can vary depending on the conditions.
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Ethanoic acid (CH3COOH) has three types of protons: those in the -CH3 group, and the one in the -OH group of the carboxylic acid. The -CH3 group would give a singlet in the 1-2 ppm region, and the -OH proton would give a broad singlet, typically in the 10-12 ppm region, but this can vary depending on the conditions.
So, the correct answer choices would be:
- Ethanal would give a singlet in the 1-2 ppm region and a singlet in the 9-10 ppm region
- Ethanol would give a triplet in the 1-2 ppm region, a quartet in the 3-4 ppm region, and a broad singlet in the 2-5 ppm region
- Ethanoic acid would give a singlet in the 1-2 ppm region and a broad singlet in the 10-12 ppm region
Similar Questions
Using 1H NMR, what key features would be used to differentiate benzene, hexane and 1,2-dichloroethane?Group of answer choicesHexane would give a singlet at 7-8 ppmBenzene would give multiple signals (triplets, quartets etc.) in the 0-1.5 ppm region1,2-dichloroethane would give a singlet in the 2.5-5 ppm region1,2-dichloroethane would give a singlet at 7-8 ppmBenzene would give multiple signals (triplets, quartets etc.) in the 0-1.5 ppm regionHexane would give a singlet in the 2.5-5 ppm regionBenzene would give a singlet at 7-8 ppmHexane would give multiple signals (triplets, quartets etc.) in the 0-1.5 ppm region1,2-dichloroethane would give a singlet in the 2.5-5 ppm region1,2-dichloroethane would give a singlet at 7-8 ppmHexane would give multiple signals (triplets, quartets etc.) in the 0-1.5 ppm regionBenzene would give a singlet in the 2.5-5 ppm region
The peak at 2.1 ppm in the 1H NMR spectrum of Molecule A is most likely to be a:
Which of the following molecules will produce a 1H-NMR spectrum with a peak area ratio of 3 : 1?I CH3CH2CH3 II CH3CHCl2III CH3OH
A compound has a 1H NMR signal around δ 10.0 ppm. What structural feature is likely to be present in the compound?Select answer from the options belowA carbon-carbon triple bondA cyclohexyl ring An aromatic ringAn aldehydeA carbonyl groupA hydroxyl group
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