The compound shown gives two 1H NMR signals. Which of the structures shown also gives exactly two signals? Chemically equivalent hydrogens give one signal; ignore coupling and axial/equatorial differences.

AStructure A
BStructure B
CStructure C
DStructure D

Answer: C

The reference is p-xylene (2 signals). Structure A, ethanol, has 3 and B, 1-methoxypropane, has 4. Structure C, 2,3-dimethylbutane, has two kinds of H (the 12 methyl H and 2 methine H), 2 signals. D, o-xylene, has 3.

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