Question

How many unique 1H NMR and 13C NMR signals exist for the following compounds? 1H NMR signals 13C NMR signals

Answer 1

Concepts and reason

The number of signals in ${}^1{\rm{H}}{\kern 1pt} {\kern 1pt} {\rm{NMR}}$ or ${}^{13}{\rm{C}}{\kern 1pt} {\kern 1pt} {\rm{NMR}}$ depends on the number of chemically equivalent sets of hydrogen atoms or carbon atoms present in that molecule.

Fundamentals

The ${}^1{\rm{H}}{\kern 1pt} {\kern 1pt} {\rm{NMR}}$ spectroscopy gives information about the number of different chemically equivalent hydrogen atoms present in a molecule.

The ${}^{13}{\rm{C}}{\kern 1pt} {\kern 1pt} {\rm{NMR}}$ gives information about the number of different chemically equivalent carbon atoms present in a molecule.

(a)

The number of unique ${}^1{\rm{H}}{\kern 1pt} {\kern 1pt} {\rm{NMR}}$ signals for the given compounds are as shown here:

(b)

The number of unique ${}^{13}{\rm{C}}{\kern 1pt} {\kern 1pt} {\rm{NMR}}$ signals for the given compounds are as shown here:

Ans: Part a

The number of unique ${}^1{\rm{H}}{\kern 1pt} {\kern 1pt} {\rm{NMR}}$ signals for the given compounds are as shown here:

Part b

The number of unique ${}^{13}{\rm{C}}{\kern 1pt} {\kern 1pt} {\rm{NMR}}$ signals for the given compounds are as shown here: