Chapter L4, Problem 1CTQ

Interpretation Introduction

Interpretation:

The number of chemically distinct protons in the given molecule should be predicted.

Concept Introduction:

NMR stands for nuclear magnetic resonance. A given compound contains different types of H-signals due to the presence of different magnetic environment within a molecule.

The number of signals obtained by the proton can be determined by spitting rule (n + 1), where n represents the number of the adjacent protons.

Answer to Problem 1CTQ

The number of chemically distinct proton in given molecule is 2.

Explanation of Solution

The protons present in the same environment are known as chemically equivalent protons. The number of chemically equivalent protons present in a molecule tells the number of peak obtained in the spectra for given molecule. The NMR spectra of the given molecule is represented as follows:

The triplet in the spectra represents that it has two neighbouring protons which means the triplet is representing protons a. on the other hand, the quartet means it has three neighbouring protons thus, representing the methyl group. As the number of peaks in the spectra is 2, that means two different chemically equivalent protons are present in the given molecule.

Thus, there are two chemically distinct protons in the model .