Practice question

The n+1 rule describes how many lines appear for a nucleus coupled to n equivalent spin half neighbors. Each neighbor can adopt up or down orientation, producing n+1 distinct local magnetic fields at observed nucleus. This multiplicity reveals number of adjacent protons, aiding structural elucidation. For example, triplet indicates two neighbors, quartet three neighbors. In undergraduate biochemistry, rule assigns ethanol CH3 triplet and CH2 quartet, lactate or alanine methyl doublets. Combined with chemical shift and integration, splitting pattern decodes carbon skeleton of metabolites without needing two-dimensional spectra.