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