IB Chemistry HL S3.2 Functional groups: classification of organic compounds questions

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Question 1

Multiple choiceEasy1 mark

In a compound’s ¹H NMR spectrum, the signal from a CH₂ group is a quartet. Assume the splitting is caused by equivalent hydrogen atoms on adjacent carbon atoms. How many equivalent adjacent hydrogen atoms cause the splitting?

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Answer: D. A quartet contains four peaks. When splitting is caused by equivalent hydrogen atoms on adjacent carbon atoms, the number of peaks is one greater than the number of those hydrogen atoms: 4 − 1 = 3.

A: associates no adjacent hydrogen atoms with a quartet; no adjacent hydrogen atoms would give a singlet.
B: associates one adjacent hydrogen atom with a quartet; it gives a doublet.
C: associates two adjacent hydrogen atoms with a quartet; they give a triplet.
Remember: the number of equivalent adjacent hydrogen atoms is one less than the number of peaks.

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