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Magazine Chapter 14: Q.21558-14-27P. (page 557)
How many lines are observed in the 13C NMR spectrum of each compound?
a.
b.
c.
d.
Short Answer
a. Two lines
b. Four lines
c. Three lines
d. Four lines
Step by step solution
13CNMR spectroscopy
13CNMR spectroscopy is used to identify or characterize unknown compounds.
The spectroscopy is also used to distinguish between different isomers of a compound.
Signals in 13C NMR spectroscopy
The number of lines/signals in a 13C NMR spectrum depends on the number of non-equivalent carbon atoms (carbon atoms that have different chemical environment) present in the compound.
Equivalent carbon atoms show a single signal in the 13C NMR spectrum.
Lines observed in the 13C NMR spectrum of the given compounds
a.
Non-equivalent carbon atoms in a
The given compound consists of two non-equivalent carbon atoms and hence will show two signals in its spectrum.
b.
Non-equivalent carbon atoms in b
The given compound consists of four non-equivalent carbon atoms and hence will show four signals in its spectrum.
c.
Non-equivalent carbon atoms in c
The given compound consists of three non-equivalent carbon atoms and hence will show three signals in its spectrum.
d.
Non-equivalent carbon atoms in d
The given compound consists of four non-equivalent carbon atoms and hence will show four signals in its spectrum.
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