Which of the following observations would most likely be seen when performing an H-NMR on 1-ethyl ethanoate (below)?a)A singlet, a doublet, and a tripletb)One doublet and one tripletc)One singlet and two tripletsd)A singlet, a triplet, and a quartetCorrect answer is option 'D'. Can you explain this answer?

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Which of the following observations would most likely be seen when performing an H-NMR on 1-ethyl ethanoate (below)?

a)
A singlet, a doublet, and a triplet
b)
One doublet and one triplet
c)
One singlet and two triplets
d)
A singlet, a triplet, and a quartet

Correct answer is option 'D'. Can you explain this answer?

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Which of the following observations would most likely be seen when per...

Looking at the structure above, we can see that the molecule only contains three carbons bonded to protons. These carbons are labeled 1, 2 and 3.
An important concept in NMR questions is determining if two carbons on the same compound will have protons split identically, and thus indistinguishable in an NMR (i.e. will those two carbons represent two individual peaks or one large peak?). In this case, C1 and C3 are clearly distinguishable from C2, since C1 and C3 are bonded to 3 hydrogens, while C2 is only bonded to two. Because C2 is adjacent to a three proton carbon, we know that the splitting pattern will display at least one quartet. This will narrow our answer choices down to two options.
Because C1 and C3 contain the same number of protons, we need to determine if they will represent one large peak, or two separate peaks. Looking at the compound, we can see that C3 is adjacent to a two-proton carbon in C2, while C1 is not adjacent to any proton-bonded carbons; therefore, we can expect that C1 will not be split by any protons, and will display a singlet, and C3 will be split by 2 protons, and will display a triplet.
As a final result, we would expect to see one singlet, one triplet and one quartet.

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Which of the following observations would most likely be seen when performing an H-NMR on 1-ethyl ethanoate (below)?a)A singlet, a doublet, and a tripletb)One doublet and one tripletc)One singlet and two tripletsd)A singlet, a triplet, and a quartetCorrect answer is option 'D'. Can you explain this answer?

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