See attached picture. **Problem 4: Proton Coupling in Molecules**Below are three molecular structures labeled (a), (b), and (c). For each molecule, analyze the coupling of the protons that are indicated. The types of coupling are defined as follows:- Singlet (s)- Doublet (d)- Triplet (t)- Quartet (q)- Doublet of doublets (dd), etc.**Instructions:**After determining the coupling for the indicated protons, write the corresponding notation in the boxes provided for each molecule. Finally, in the lower boxes, provide the number of unique protons and unique carbons present in each structure.**Molecules Description:**- **Molecule a)** The structure contains a bromine (Br) atom and a methyl group (CH₃). It includes several distinct protons on an aromatic ring as well as protons on methyl groups. - **Boxes to fill in:** - Coupling type for specified protons. - Number of unique protons. - Number of unique carbons.- **Molecule b)** This molecule features chlorine (Cl) and bromine (Br) atoms. It also includes methyl groups (CH₃) and multiple protons on a cyclic structure. - **Boxes to fill in:** - Coupling type for specified protons. - Number of unique protons. - Number of unique carbons.- **Molecule c)** The structure contains oxygen atoms in ether linkages, with methyl groups (CH₃) and a distinct arrangement of protons. - **Boxes to fill in:** - Coupling type for specified protons. - Number of unique protons. - Number of unique carbons.**Note:** The process of determining the coupling involves careful analysis of the neighboring atoms and understanding their influence on the NMR spectra. This exercise helps strengthen skills in interpreting and analyzing molecular structures through spectroscopic techniques.

Concept of coupling in 1H NMR spectroscopy.

4) For the following molecules give the coupling of the protons that are indicated (singlet=s; doublet=d; triplet=t; quartet= q; doublet of doublets= dd; etc). In the bottom box give the number of unique protons and carbons in each molecule. a) b) c) Br, H H- CH3 H H H H н нн нн ннн CH3 H. H3C ci H Br H ci H H H CH3 `CH3 нн Hi CH3 ČH3 number of number of number of number of number of number of unique protons: unique carbons: unique protons: unique carbons: unique protons: unique carbons:

4) For the following molecules give the coupling of the protons that are indicated (singlet=s; doublet=d; triplet=t; quartet= q; doublet of doublets= dd; etc). In the bottom box give the number of unique protons and carbons in each molecule. a) b) c) Br, H H- CH3 H H H H н нн нн ннн CH3 H. H3C ci H Br H ci H H H CH3 `CH3 нн Hi CH3 ČH3 number of number of number of number of number of number of unique protons: unique carbons: unique protons: unique carbons: unique protons: unique carbons:

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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