|
Interpreting the infrared
spectrum of 1-bromo-2-chloroethane
[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 infrared spectrum of 1-bromo-2-chloroethane
[updated
Mar 11th 2026 *]
*
email doc
brown * [privacy policy,
cookies & disclaimer] Re-edit infrared spectrum of BrCH2CH2Cl
*
LINKS associated
with 1-bromo-2-chloroethane
*
The
chemistry of organic halogen compounds
SEARCH?
This is a BIG
website, you need to take time to explore it
Infrared spectroscopy - spectra index
Introductory note on the infrared spectrum of 1-bromo-2-methylethane
Students and teachers please note
my explanation of the infrared
spectrum of 1-bromo-2-methylethane is designed
for advanced, but pre-university, chemistry courses.
Based in
the infrared spectrum diagram for 1-bromo-2-methylethane, only some of the most
prominent peaks for particular bond vibrations are discussed,
particularly if 1-bromo-2-methylethane has a functional group with a particular
characteristic wavenumber peak.
The infrared spectrum of
1-bromo-2-methylethane is
unique and the whole, or selected wavenumbers, can be used to
fingerprint its identity, sometimes analysing a mixture
containing 1-bromo-2-methylethane or following its change of concentration in a
reaction.
Spectra obtained from a liquid film of
1-bromo-2-chloroethane. The right-hand part of the of the
infrared spectrum of 1-bromo-2-chloroethane, wavenumbers
~1500 to 400
cm-1 is considered the fingerprint region for the
identification of 1-bromo-2-chloroethane and most organic compounds. It is due to a unique set
of complex overlapping vibrations of the atoms of the molecule of
1-bromo-2-chloroethane.
1-bromo-2-chloroethane,
C2H4BrCl,
BrCH2CH2Cl
The molecular structure and naming of haloalkanes
Interpretation of
the infrared spectrum of 1-bromo-2-chloroethane
The most prominent infrared absorption lines of
1-bromo-2-chloroethane
Several moderately strong absorption bands at
wavenumbers 2975 to 2845 cm-1 for C-H stretching vibrations -
collectively give the impression of strong absorption
in the infrared spectrum of 1-bromo-2-chloroethane.
Several strong absorption bands from C-H deformation
vibrations at wavenumbers 1470 to 1370 cm-1.
Several strong absorption bands from 880 to 500 cm-1
due to the C-Cl and C-Br stretching vibrations of
1-bromo-2-chloroethane.
The fingerprint pattern for
1-bromo-2-chloroethane is unique, but apart from characteristic C-Br and
C-Cl absorption bands, there is little to distinguish in its infrared
spectrum.
The absence of other specific functional group bands
will show that a particular functional group is absent from the
1-bromo-2-chloroethane
molecular
structure.
Although the fingerprint pattern would
be different for the infrared spectrum of 1-bromo-1-chloroethane
(CH2CH2BrCl)
compared to 1-bromo-2-chloroethane (BrCH2CH2Cl),
there would be little difference in the wavenumbers of the main peaks.
Summary of the infrared spectrum of 1-bromo-2-chloroethane
and extra comments
The infrared (IR) spectrum of
1-bromo-2-chloroethane (C2H4BrCl)
with a focus on key absorptions, common misconceptions, and exam-relevant
insights.
Key
wavenumber features of the infrared spectrum
of 1-bromo-2-chloroethane
|
Bond Type |
Vibration Mode |
Wavenumber Range (cm⁻¹) |
Notes |
|
C-H (sp³) |
Stretching |
2850-3000 |
Typical
alkane C-H stretch; moderate intensity |
|
C-H (CH2) |
Bending
(scissoring) |
1450-1470 |
Often
appears as a medium doublet |
|
C-H (CH2) |
Rocking |
~1370 |
Weak;
may be obscured in mixtures |
|
C-Br |
Stretching |
690-515 |
Strong,
sharp; lower end of fingerprint region |
|
C-Cl |
Stretching |
850-550 |
Broad,
moderate intensity; overlaps with other fingerprint features |
|
CH2-X (wagging) |
Wagging/Bending |
1300-1150 |
Often
seen in halogenated alkanes |
Fingerprint
Region (1200-600 cm⁻¹) of the infrared spectrum of
1-bromo-2-chloroethane
- This region is rich in C-X
stretches and C-H bending vibrations.
- C-Br and C-Cl
stretches are prominent and diagnostic for halogen substitution.
- Expect multiple overlapping bands,
making interpretation trickier without reference spectra.
Common
Misconceptions
about the infrared spectrum of 1-bromo-2-chloroethane
(see also below)
|
Misconception |
Clarification |
| "Halogen
stretches appear above 1000 cm⁻¹ |
Not true-C-Br
and C-Cl stretches are typically
below 850 cm⁻¹ |
| "All C-H
stretches are sharp and intense" |
sp³
C-H stretches are
moderate; intensity varies with dipole moment changes |
| "Fingerprint
region is unimportant" |
It’s
crucial for compound identification-especially for halogenated
molecules |
| "C-Br and
C-Cl stretches are indistinguishable" |
They differ
in position and intensity; C-Br is lower and sharper |
Exam Tips
for questions involving the infrared spectrum
of
1-bromo-2-chloroethane
(see also above)
- Label key regions:
Group frequency (above 1500 cm⁻¹) versus fingerprint (below 1500 cm⁻¹).
- Use reference tables:
Especially for halogen stretches-don’t guess!
- Compare spectra:
Practice distinguishing between similar halogenated compounds.
- Watch for symmetry:
Symmetrical molecules may show weaker IR bands due to reduced dipole
changes.
- Don’t overlook weak bands:
Even low-intensity peaks can be diagnostic in halogenated compounds.
Key words & phrases:
C2H4BrCl BrCH2CH2Cl image and diagram explaining the infrared spectrum
of 1-bromo-2-chloroethane, complete infrared absorption spectrum of
1-bromo-2-chloroethane, comparative spectra of
1-bromo-2-chloroethane, prominent peaks/troughs for identifying functional groups in the infrared spectrum of
1-bromo-2-chloroethane,
important wavenumber values in cm-1 for peaks/troughs in the infrared spectrum
of 1-bromo-2-chloroethane, revision of infrared spectroscopy of
1-bromo-2-chloroethane, fingerprint region analysis of
1-bromo-2-chloroethane, how to identify 1-bromo-2-chloroethane from its infrared spectrum, identifying organic
compounds like 1-bromo-2-chloroethane from their infrared spectrum,
how to analyse the absorption bands in the infrared spectrum of
1-bromo-2-chloroethane detection of functional groups in the
1-bromo-2-chloroethane molecule example of the infrared spectrum of a
molecule like 1-bromo-2-chloroethane with a functional group
interpreting interpretation of the infrared spectrum of
1-bromo-2-chloroethane shows presence
of functional group How do you interpret the infrared absorption spectrum of
1-bromo-2-chloroethane How
to interpret the infrared spectrum of 1-bromo-2-chloroethane Explanatory diagram of the infrared spectrum of the
1-bromo-2-chloroethane molecule
in terms of its molecular structure.
Listing data of the prominent main wavenumber peaks troughs in the infrared
spectrum of 1-bromo-2-chloroethane. How to explain the infrared spectrum of
1-bromo-2-chloroethane. Use of
the infrared spectrum of 1-bromo-2-chloroethane, identification of
1-bromo-2-chloroethane from its
infrared spectrum - fingerprint wavenumber pattern to identify the
1-bromo-2-chloroethane
molecule. The uses of the infrared spectrum of the
1-bromo-2-chloroethane molecule. The
distinctive features of the infrared spectrum of the
1-bromo-2-chloroethane molecule
explained. explaining the peaks-trough of the transmittance of the infrared
spectrum of 1-bromo-2-chloroethane what does the infrared spectrum tell you about the
structure and properties of the 1-bromo-2-chloroethane molecule?
Links associated with 1-bromo-2-chloroethane
The mass
spectrum of 1-bromo-2-chloroethane
The H-1 NMR
spectrum of 1-bromo-2-chloroethane
The C-13 NMR
spectrum of 1-bromo-2-chloroethane
The
physical properties, hazards and uses of
halogenoalkanes (haloalkanes)
The chemistry of HALOGENOALKANES (haloalkanes)
revision notes INDEX
Infrared spectroscopy index
ALL SPECTROSCOPY INDEXES
All Advanced Organic
Chemistry Notes
Use My Google search site box
Email doc b:
chem55555@hotmail.com
|
