BRAINCAKEThe n+1 Rule
The n+1 rule: a hydrogen environment with n hydrogen atoms on the adjacent carbon atom(s) is split into n + 1 lines.
• n = 0: singlet
• n = 1: doublet, heights 1:1
• n = 2: triplet, heights 1:2:1
• n = 3: quartet, heights 1:3:3:1
• n = 6: septet (7 lines)
The relative heights of the lines follow Pascal's triangle.
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