Discussion
A proton signal is split into 5 lines. The number of equivalent neighbouring protons is
Answer: B
Correct answer: 4
The multiplicity is \( n + 1 \), so five lines mean
\[ n = 5 - 1 = 4 \]equivalent neighbouring protons, giving a quintet with intensities 1:4:6:4:1. The middle methylene of a propyl chain flanked by a methyl and another methylene shows exactly this pattern.
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