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Magazine Chapter 14: Q27P (page 527)
How many lines are observed in the \({}^{{\bf{13}}}{\bf{C}}\) 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
Step 1: \({}^{{\bf{13}}}{\bf{C}}\) NMR spectroscopy
\({}^{{\bf{13}}}{\bf{C}}\)NMR spectroscopy is used to identify or characterize unknown compounds.
The spectroscopy is also used to distinguish between different isomers of a compound.
Signals in \({}^{{\bf{13}}}{\bf{C}}\) NMR spectroscopy
The number of lines/signals in a \({}^{13}C\) 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 \({}^{13}C\) NMR spectrum.
Lines observed in the \({}^{{\bf{13}}}{\bf{C}}\) 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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