Question

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.