NMR Multiplet Splitting in Bromoethane

NMR multiplet splitting in bromoethane shows how nearby protons affect each other through bonds. The three methyl protons are coupled to the two methylene protons that are three bonds away. By the n+1 rule, the methyl signal splits into three peaks with a 1:2:1 pattern.

The methylene protons also...

In bromoethane, the three methyl protons are coupled to the two methylene protons three bonds away.

So, the signal from the methyl protons is split into a triplet, while the methylene protons appear as a quartet.

Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-one-half state.

It fo...