In 1H NMR spectroscopy, what splitting pattern is observed for the hydrogen atoms on the -CH2- carbon of pure bromoethane (CH3-CH2-Br)?

Answer and explanation

Correct answer: B. Quartet (four peaks in 1:3:3:1 ratio)

  1. Step 1: The n+1 rule dictates peak multiplicity, where n is the number of protons on adjacent carbons. Step 2. The -CH2- protons are adjacent to -CH3 with n = 3 protons. Multiplicity = 3 + 1 = 4 (quartet, 1:3:3:1). Answer: Quartet (four peaks in 1:3:3:1 ratio). Why not the others: The -CH3 protons couple with 2 neighbours, appearing as a triplet (2 + 1 = 3).

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