MCAT Question A Day - 4/6/13 - Answer!
The number of signals in the NMR spectrum of 2-bromopropene is
A. 0
B. 2
C. 3
D. It cannot be determined.
The correct answer is (C).
a,b, and c indicate the three different kinds of protons. a and (b,c) are clearly chemically inequivalent protons, that is, protons with different environments. b and c, however, are stereochemically inequivalent, and therefore their environments differ as well. Consequently, one would expect three NMR signals to match with three different protons.
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