Advanced Organic Chemistry: 1H NMR spectrum of 2-chloropropane  CH3CHClCH3

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Explaining & interpreting 1H (proton) NMR spectrum of 2-chloropropane

[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 - analysing the 1H NMR spectrum of 2-chloropropane [updated Mar 12th 2026 *]

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 H-1 proton NMR spectroscopy - spectra index

Introductory note on the 1H NMR spectra of 2-chloropropane

Students and teachers please note my explanation of the proton NMR spectrum of 2-chloropropane is designed for advanced, but pre-university, chemistry courses.

The chemical shift δ splitting pattern effects for 2-chloropropane 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 2-chloropropane 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 2-chloropropane molecule.

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

C3H7Cl CH3CHClCH3 low and high resolution 1H proton nmr spectrum of 2-chloropropane analysis interpretation of chemical shifts ppm spin spin line splitting diagram H1 H-1 nmr for  isopropyl chloride explaining spin-spin coupling for line splitting 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 resonances, called chemical shifts, are measured with respect to the TMS, and depend on the individual (electronic) chemical environment of the hydrogen atoms in an organic molecule - 2-chloropropane here.

The chemical shifts quoted in ppm on the diagram of the H-1 NMR spectrum of 2-chloropropane 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 2-chloropropane molecule.

2-chloropropane  C3H7Cl  (c) doc b  (c) doc b  (c) doc b

The molecular structure and naming of haloalkanes

Interpreting the H-1 NMR spectrum of 2-chloropropane

In terms of spin-spin coupling from the possible proton magnetic orientations, for 2-chloropropane I have only considered the interactions of non-equivalent protons on adjacent carbon atoms e.g. -CH-CH3 protons.

For relatively simple molecules, the low resolution H-1 NMR spectrum of 2-chloropropane is a good starting point (low resolution diagram above).

The hydrogen atoms (protons) of 2-chloropropane occupy 2 different chemical environments so that the low resolution NMR spectra should show 2 principal peaks of different H-1 NMR chemical shifts (diagram above for 2-chloropropane).

CH3CHClCH3

Note the proton ratio 6:1 of the 2 colours of the protons in the 2 chemically different environments

Chemical shifts (a) to (b) on the H-1 NMR spectrum diagram for 2-chloropropane.

Although there are 7 hydrogen atoms in the molecule, there are only 2 possible different chemical environments for the hydrogen atoms in 2-chloropropane molecule.

The integrated signal proton ratio 6:1 observed in the high resolution H-1 NMR spectrum, corresponds with the structural formula of 2-chloropropane.

The high resolution 1H NMR spectrum of 2-chloropropane

All low and high resolution spectra of 2-chloropropane show 2 groups of proton resonances and in the 6:1 ratio expected from the formula of 2-chloropropane.

The ppm quoted on the diagram represent the peak of resonance intensity for a particular proton group in the molecule of 2-chloropropane - since the peak' is at the apex of a band of H-1 NMR resonances due to spin - spin coupling field splitting effects - see high resolution notes on 2-chloropropane below.

So, using the chemical shifts and applying the n+1 rule to 2-chloropropane and make some predictions using some colour coding! (In problem solving you work the other way round!)

(a) 1H Chemical shift 1.44 ppm, CH3 protons: CH3CHClCH3

This resonance is split into a 1:1 doublet by the adjacent CH proton (n+1 = 2)

Evidence for the presence of a CH group in the molecule of 2-chloropropane

(b) 1H Chemical shift 3.74 ppm, CH proton: CH3CHClCH3

This resonance is split into a 1:6:15:20:15:6:1 septet by 2x adjacent CH3 protons (n+6 = 7)

Evidence for the presence of a CH3-C-CH3 grouping in the molecule of 2-chloropropane

Note the decreased effect on the 1H chemical shift as the proton is further from the more electronegative oxygen and nitrogen bromine chlorine atoms 2-chloropropane.

Summary of key points for the 1H NMR spectrum of 2-chloropropane plus extra exam revision comments

The ¹H NMR spectrum of 2-chloropropane (CH3CHClCH3) with clarity, precision, and exam-board alignment. This molecule is symmetrical and contains two distinct proton environments, making it a great example for mastering integration, splitting, and chemical shift interpretation.

Key Features of the 1H NMR spectrum of 2-chloropropane

  • Two proton environments: One methine (CH) proton and two equivalent methyl (CH3) groups.
  • Electronegative chlorine causes deshielding of the methine proton.
  • Spin-spin splitting arises from coupling between the CH and CH3 protons.

H-1 Chemical Shifts, Origins, and Integration for the 1H NMR spectrum of 2-chloropropane

Chemical Shift (δ, ppm) Proton Type Origin Splitting Pattern Integration Ratio
~3.8, 3.74 ppm CH (methine) Deshielded by adjacent Cl atom Septet (6 neighbours) 1
~1.5, 1.44 ppm CH3 (methyl ×2) Shielded, distant from Cl Doublet (1 neighbour) 6

CH3CHClCH3

Note: Exact shifts may vary slightly depending on solvent and instrument, but the pattern remains consistent.

Note: The septet arises from coupling with six equivalent methyl protons (n = 6 → n+1 = 7), and the doublet from coupling with the single methine proton (n = 1 → n+1 = 2).

Common Misconceptions about the 1H NMR spectrum of 2-chloropropane (see below too)

  • Mistaking the septet for a multiplet: It’s specifically a 7-peak pattern due to 6 adjacent protons.
  • Assuming unequal methyl environments: Both CH3 groups are equivalent due to molecular symmetry.
  • Overlooking integration clues: The 6:1 ratio is a strong indicator of two methyl groups versus one methine.
  • Expecting OH or aromatic shifts: There are none — this is a simple halogenoalkane.

Exam Revision Tips for questions involving the 1H NMR spectrum of 2-chloropropane (AQA, Edexcel, OCR, WJEC, CCEA, CIE, IB) (see above too)

  • Use the n+1 rule confidently: Especially for symmetrical molecules like 2-chloropropane.
  • Integration matters: A 6:1 ratio strongly suggests two methyl groups and one other proton.
  • Chemical shift awareness:
    • CH adjacent to Cl: ~3.8 ppm
    • CH3 groups: ~1.5 ppm
  • Splitting patterns reveal adjacency: Doublet ↔ 1 neighbour, Septet ↔ 6 neighbours.
  • Practice with simulated spectra: Many boards (OCR, IB, Edexcel) expect interpretation from raw data.
  • Don’t forget symmetry: It simplifies the number of signals and helps predict integration ratios.

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) and applied to the 1H NMR spectrum of 2-chloropropane.
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

Key words & phrases: C3H7Cl CH3CHClCH3 Interpreting the proton H-1 NMR spectra of 2-chloropropane, low resolution & high resolution proton nmr spectra of 2-chloropropane, H-1 nmr spectrum of 2-chloropropane, understanding the hydrogen-1 nmr spectrum of 2-chloropropane, explaining the line splitting patterns from spin-spin coupling  in the high resolution H-1 nmr spectra of 2-chloropropane, revising the H-1 nmr spectrum of 2-chloropropane, proton nmr of 2-chloropropane, ppm chemical shifts of the H-1 nmr spectrum of 2-chloropropane, explaining and analyzing spin line splitting in the H-1 nmr spectrum, how to construct the diagram of the H-1 nmr spectrum of 2-chloropropane, how to work out the number of chemically different protons in the structure of the 2-chloropropane organic molecule, how to analyse the chemical shifts in the hydrogen-1 H-1 proton NMR spectrum of 2-chloropropane using the n+1 rule to explain the spin - spin coupling splitting in the proton nmr spectrum of 2-chloropropane deducing the nature of the protons from the chemical shifts ppm in the H-1 nmr spectrum of 2-chloropropane examining the 1H nmr spectrum of  2-chloropropane analysing the 1-H nmr spectrum of 2-chloropropane how do you sketch and interpret the H-1 NMR spectrum of 2-chloropropane interpreting interpretation of the 1H proton spin-spin coupling causing line splitting in the NMR spectrum of 2-chloropropane  assignment of chemical shifts in the proton 1H NMR spectrum of 2-chloropropane formula explaining spin-spin coupling for line splitting of  isopropyl chloride How do you interpret the H-1 NMR spectrum of 2-chloropropane How to interpret the H-1 NMR spectrum of 2-chloropropane Explanatory diagram of the chemical shifts of the 1H H-1 proton NMR spectrum of the 2-chloropropane molecule in terms of its molecular structure. Listing data of all the chemical shift peaks in ppm in the proton NMR spectrum of 2-chloropropane. How to explain the H-1 NMR spectrum of 2-chloropropane. The chemical shifts and  integrated values of the proton ratios in the 1-H NMR spectrum of the 2-chloropropane molecule. How to work out the molecular structure of the 2-chloropropane molecule from its proton NMR spectrum. The uses and distinctive features of the proton NMR spectrum of the 2-chloropropane molecule explained. What does the H-1 proton NMR spectrum chemical shifts tell us about the structure and properties of the 2-chloropropane molecule? explaining the spin-spin proton coupling effects in the 1H NMR spectrum of 2-chloropropane. diagram explaining the proton splitting pattern produced from the n+1 rule and the theoretical ratio of chemical shift and values of intensities for the proton NMR spectrum lines of 2-chloropropane

Links associated with 2-chloropropane

The infrared spectrum of 2-chloropropane

The mass spectrum of 2-chloropropane

The C-13 NMR spectrum of 2-chloropropane

The chemistry of HALOGENOALKANES (haloalkanes) revision notes INDEX

H-1 proton NMR spectroscopy index  (Please read 8 points at the top of the 1H NMR index page)

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