# Why does peak decoupling occur in H-NMR spectra?

For example, when we analyze the conversion of some chemical compound, certain characteristic areas tend to decrease (ok).

However, why can a peak (i.e., one peak) generate smaller peaks (i.e., more than one peak) in this case of conversion of some chemical compound (even if the total area decreases, indicating a reaction)?

• Different substances have different spectra. Mixtures give, in very good approximation, just the weighted average of the spectra of the constituents. – Karl Feb 20 at 22:10
• Thanks for the answer. – Emerson P L Feb 21 at 7:39