Advanced Organic Chemistry: 1H NMR spectrum of chlorobenzene C6H5Cl

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Interpreting the H-1 (proton) NMR spectrum of chlorobenzene C6H5Cl

[Author © Dr Phil Brown PhD: Doc Brown's advanced level organic chemistry exam revision notes suitable for students of UK A level chemistry courses & US K12 grade 11, grade 12 and AP honors chemistry courses: Molecular spectroscopy analysis of chlorobenzene [spectra page updated Mar 22nd 2026 *]

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 H-1 proton NMR spectroscopy - spectra index

Introductory note on the 1H NMR spectra of chlorobenzene

Students and teachers please note my explanation of the proton NMR spectrum of chlorobenzene is designed for advanced, but pre-university, chemistry courses.

The chemical shift δ splitting pattern effects for chlorobenzene are confined to a proton spin-spin coupling effects analysed using the n+1 rule for adjacent non-equivalent proton fields (n is the number of neighbouring protons in a non-equivalent different chemical environment for the chlorobenzene molecule).

It is assumed that the integrated intensities of the 1H NMR δ chemical shifts give the ratio of the protons in the different non-equivalent chemical environments of the chlorobenzene molecule.

The most common solvent used for investigating the 1H NMR spectrum of compounds like chlorobenzene, is CDCl3 and other deuterated solvents to avoid confusion with a 1H NMR signal, 2D (2H) has a different NMR chemical shift.

C6H5Cl low and high resolution 1H proton nmr spectrum of chlorobenzene analysis interpretation of chemical shifts ppm spin spin line splitting diagram H1 H-1 nmr for chlorobenzene doc brown's advanced organic chemistry revision notes

TMS is the acronym for tetramethylsilane, formula Si(CH3)4, whose protons are arbitrarily given a chemical shift of 0.0 ppm. This is the 'standard' in 1H NMR spectroscopy and all other proton shifts, called chemical shifts, depend on the individual (electronic) chemical environment of the hydrogen atoms in an organic molecule - chlorobenzene here.

The chemical shifts quoted in ppm on the diagram of the H-1 NMR spectrum of chlorobenzene represent the peaks of the intensity of the chemical shifts of (which are often groups of split lines at high resolution) AND the relative integrated areas under the peaks gives you the ratio of protons in the different chemical environments of the chlorobenzene molecule.

chlorobenzene, C6H5Cl, (c) doc b    monosubstituted benzene compound

The molecular structure and naming of aromatic compounds

Interpreting the H-1 NMR spectrum of chlorobenzene

The hydrogen atoms (protons) of chlorobenzene occupy 3 different chemical environments so that the very high resolution NMR spectra should show 3 peaks for 3 different H-1 NMR chemical shifts (diagram above for chlorobenzene).

Chemical shifts (a) to (c) on the H-1 NMR spectrum diagram for chlorobenzene.

(a) to (c) 1H Chemical shift 7.14 to 7.43 ppm

All three proton resonances are close together, but you need very high resolution to sort them out.

Theoretically for the 1H NMR resonance peaks

(a) is for the proton attached to carbon atom C4.

(b) is for the protons attached to carbon atoms C3 and C5 (equivalent chemical environments).

(c) is for the protons attached to carbon atoms C2 and C6 (equivalent chemical environments).

The integrated proton ratio would be (1) : (2) : (2), but you would need very resolution to observe this in 1-H NMR spectrum of chlorobenzene.

Theoretically there are doublets and triplets from the spin-spin coupling of the proton fields of the benzene ring i.e. a and b would be triplets and c a doublet - can you see why theoretically?

The group of these spectral lines is typical of a benzene ring group of protons i.e. -H bonds in the molecule of chlorobenzene.

The splitting pattern from proton spin-spin coupling effects is analysed using the n+1 rule for adjacent non-equivalent proton fields (n is the number of neighbouring protons in a non-equivalent different chemical environment).

Number of directly adjacent protons 1H causing splitting Splitting pattern produced from the n+1 rule on spin-spin coupling and the theoretical ratio of line intensities
0 means no splitting             1            
1 creates a doublet           1   1          
2 creates a triplet         1   2   1        
3 creates a quartet       1   3   3   1      
4 creates a quintet     1   4   6   4   1    
5 creates a sextet   1   5   10   10   5   1  
6 creates a septet 1   6   15   20   15   6   1

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