Textbook Question
How many distinct signals would you expect to see in the ¹H NMR spectrum of the following molecules? [Ignore diastereotopic hydrogens for the sake of this assessment.]
(c)
15. Analytical Techniques:IR, NMR, Mass Spect
1H NMR:Number of Signals
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How many types of electrically unique protons (peaks) are there in the following molecule?
A
7
B
8
C
9
D
5
Verified step by step guidance1
Identify the structure of the molecule: The image shows an aromatic ring (benzene) with an aldehyde group (CHO) and an isopropyl group attached.
Determine the symmetry of the molecule: The benzene ring is symmetric, but the substituents (CHO and isopropyl group) break the symmetry, leading to different environments for the protons.
Analyze the protons on the benzene ring: The presence of the aldehyde and isopropyl groups will create different chemical environments for the protons on the benzene ring, leading to multiple unique proton types.
Consider the protons on the isopropyl group: The isopropyl group has two types of protons - the methyl protons and the methine proton, which are in different environments.
Count the unique proton environments: By considering the different environments created by the substituents, count the number of unique proton environments (peaks) in the molecule.
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