Q.23. - Organic Chemistry

Question

Question: Name each compound and state how many lines are observed in its ${}^{\mathbf{13}}\mathit{C}$ NMR spectrum.

Step-by-Step Solution

Answer

Answer

a.

4-methyl isopropyl benzene

Seven lines for the above structure

b. 

3-nitro-5-bromo phenol

Six lines for the above structure

Step 1: The C 13 NMR spectrum

The ${}^{13}C$ NMR spectrum is very useful to determine the patterns of substitution in the disubstituted benzene molecules.

The only difference between the ${}^{13}C$ NMR and the NMR spectroscopy is that the ${}^{\mathbf{13}}\mathit{C}$ NMR is used to determine the number and the type of carbon atoms in an organic molecule, whereas the NMR spectroscopy is used to determine the number and the type of the hydrogen atoms in an organic molecule.

Step 2: The number of lines observed for the given molecule in the C 13 NMR spectroscopy.

a. The structure of the given compounds is following:

4-methyl isopropyl benzene

The seven peaks will be observed for the above molecule in the ${}^{13}C$ NMR spectrum as shown in the structure below:

Seven lines for the above structure

 

b. The structure of the given compounds is following:

3-nitro-5-bromo phenol

There will be six lines observed in the ${}^{13}C$ NMR spectrum of the above molecule. The number of peaks is shown below:

Six lines for the above structure