How many NMR signals does #(CH_3)_2CHCH(CH_3)_2# show?

1 Answer
Oct 28, 2014

The H NMR spectrum of 2,3-dimethylbutane shows two signals.

The molecule has a plane of symmetry. So the four CH₃ groups are equivalent, and the two C-H groups are equivalent.

We should see two signals with area ratios 12:2 or 6:1.

The CH₃ signal should appear at about δ 0.9.

The CH signal should appear at about δ 1.5.

Each signal will show spin-spin coupling.

Here is an actual spectrum of 2,3-dimethylbutane.