Which statement best describes splitting patterns in NMR?

Which statement best describes splitting patterns in NMR?

• A. Splitting arises from coupling with identical neighboring hydrogens
• B. Splitting patterns are random and uninformative
• C. Splitting occurs only in carbon-13 NMR
• D. Splitting patterns arise from coupling with neighboring non-equivalent hydrogens

Answer: (D)

Splitting patterns in NMR come from spin-spin coupling with nearby protons. The observed nucleus feels the magnetic influence of its neighbors, and this interaction splits the signal into multiple lines. The number of lines you see is governed by how many nearby protons are magnetically distinct from the observed nucleus. If a set of neighboring protons are equivalent, they contribute as a single group and you get the familiar n+1 line pattern, where n is the number of equivalent neighbors. When neighboring protons are non-equivalent—each can couple with its own strength and produce its own split—the multiplet becomes more complex. So the patterns reflect coupling to nearby hydrogens, with complexity growing when those neighbors are non-equivalent.

Splitting patterns in NMR come from spin-spin coupling with nearby protons. The observed nucleus feels the magnetic influence of its neighbors, and this interaction splits the signal into multiple lines. The number of lines you see is governed by how many nearby protons are magnetically distinct from the observed nucleus. If a set of neighboring protons are equivalent, they contribute as a single group and you get the familiar n+1 line pattern, where n is the number of equivalent neighbors. When neighboring protons are non-equivalent—each can couple with its own strength and produce its own split—the multiplet becomes more complex. So the patterns reflect coupling to nearby hydrogens, with complexity growing when those neighbors are non-equivalent.