Question: How many ¹³C NMR signals do each compound exhibit?

¹³C Spectroscopy gives the high value of chemical shift signal when the carbon-13 is present in the vicinity of the electron-withdrawing groups.

¹³C Spectroscopy gives the low value of chemical shift signal when the carbon-13 is present in the vicinity of the electron-rich groups.

The different signals of ¹³C spectroscopy are represented as:

a.

It has five signals due to the presence of five different ¹³C .

¹³C signal

b.

It has three signals due to the presence of three different ¹³C .

¹³C signal

c.

It has seven signals due to the presence of seven different ¹³C .

¹³C signal

d.

It has three signals due to the presence of three different ¹³C .

¹³C signal

e.

It has seven signals due to the presence of seven different ¹³C .

¹³C signal

f.

It has five signals due to the presence of five different ¹³C .

¹³C signal

g.

It has four signals due to the presence of four different ¹³C .

¹³C signal

h.

It has three signals due to the presence of three different ¹³C

¹³C signal