Discussion
By the n plus one rule, a proton with three equivalent neighbours appears as a
Answer: A
Correct answer: quartet
The multiplicity is \( n + 1 \) where \( n \) is the number of equivalent neighbours, so three neighbours give four lines - a quartet - with intensities 1:3:3:1 from Pascal’s triangle. This is why the classical ethyl group shows a quartet for the methylene protons, which have three methyl neighbours, and a triplet for the methyl protons, which have two.
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