Analyzing Infrared Spectra
The electromagnetic radiation or frequency is classified into radio-waves, micro-waves, infrared, visible, ultraviolet, X-rays and gamma rays. The infrared spectra emission refers to the portion between the visible and the microwave areas of electromagnetic spectrum. This spectral area is usually divided into three parts, near infrared (14,290 – 4000 cm-1), mid infrared (4000 – 400 cm-1), and far infrared (700 – 200 cm-1), respectively. The number set is the number of the wave (cm-1).
IR Spectrum Of Cyclohexanone
It is the analysis of the structure of cyclohexaone using IR data interpretation.
IR Spectrum Of Anisole
Interpretation of anisole using IR spectrum obtained from IR analysis.
IR Spectroscopy
Infrared (IR) or vibrational spectroscopy is a method used for analyzing the particle's vibratory transformations. This is one of the very popular spectroscopic approaches employed by inorganic as well as organic laboratories because it is helpful in evaluating and distinguishing the frameworks of the molecules. The infra-red spectroscopy process or procedure is carried out using a tool called an infrared spectrometer to obtain an infrared spectral (or spectrophotometer).
Which C8H10 compound gives the following 1H NMR spectrum?
A. 2
B. 3
C. 1
D. 4
![### Proton Nuclear Magnetic Resonance (NMR) Spectrum Analysis
The image above shows a ^1H NMR spectrum for an organic compound along with the molecular structures of four different aromatic compounds that could correspond to this spectrum.
#### NMR Spectrum Details
- **Chemical Shift (PPM)**: The x-axis of the spectrum represents the chemical shift in parts per million (PPM).
- **0 - 2 PPM**: A peak appears at around 1 PPM, integrating for 6 hydrogens.
- **6 - 8 PPM**: Multiple peaks appear between 7 - 8 PPM, each integrating for 2 hydrogens.
#### Molecular Structures
The molecular structures displayed below the NMR graph are:
1. **Structure 1**: Para-xylene (1,4-dimethylbenzene)
2. **Structure 2**: Ortho-xylene (1,2-dimethylbenzene)
3. **Structure 3**: Meta-xylene (1,3-dimethylbenzene)
4. **Structure 4**: 1-ethyl-2-methylbenzene
#### Interpretation of the Spectrum
1. **7-8 PPM Region**: The peaks in this region indicate the presence of aromatic protons. The integration of 4 hydrogens indicates that four aromatic protons are each producing these signals.
2. **Around 1 PPM**: The single peak integrating for 6 hydrogens indicates the presence of two methyl groups (since each methyl group has 3 hydrogens).
### Conclusion
Based on the NMR spectrum provided, the molecule in question has four aromatic protons and two methyl groups. The pattern of these peaks suggests the aromatic ring is symmetrically substituted. Hence, **para-xylene (Structure 1)** is the molecule that matches this ^1H NMR spectrum.
### Educational Insights
Proton NMR spectroscopy is a powerful analytical tool used in organic chemistry to identify and infer the structure of compounds. The ^1H NMR spectrum reveals the number of hydrogen atoms and their electronic environments, assisting in elucidating the arrangement of atoms within a molecule.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fa66738f4-d667-44f2-8055-3f1d5861f12b%2F36af274c-2522-4df4-bde7-441614aff7b1%2Fvdw74d_processed.png&w=3840&q=75)
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