How many NMR signals does #CH_3CH_2CH_2CH_3# show?
The H NMR spectrum of butane shows two signals.
The molecule has a plane of symmetry. So C-1 is equivalent to C-4, and C-2 is equivalent to C-3.
We should see two signals with area ratios 6:4 or 3:2.
The CH₃ signal should appear at about δ 0.9.
The CH₂ signal should appear at about δ 1.4.