H F 3. a. What functional groups are present in molecule C. 3. What stretches would you expect to see in an IR? Name at least 2 with approx. wavenumber. . How can you tell C from A?
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).
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**2. Annotate the following spectrum by highlighting/circling at least two important signals that are present. Determine the structure of the compound that most likely produces this spectrum.**
**[Diagram of six chemical structures labeled A to F:**
- **A**: Structure showing an acid group.
- **B**: Structure with an amide group.
- **C**: Structure with two triple bonds.
- **D**: Structure with a nitrile group.
- **E**: Structure with an ester group.
- **F**: Structure with a lactone group.]
**[IR Spectrum]:**
- **X-axis**: Wavenumber (cm⁻¹), range from about 500 to 4000.
- **Y-axis**: % Transmittance, range from 0% to 100%.
**Description of Important Features:**
- The spectrum shows several peaks throughout the wavenumber range.
- Key areas of interest include the region around 1700 cm⁻¹, typically associated with carbonyl (C=O) stretches, and the region around 3300 cm⁻¹, often indicative of N-H or O-H stretches.
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**3. a. What functional groups are present in molecule C? b. What stretches would you expect to see in an IR? Name at least 2 with approx. wavenumber. c. How can you tell C from A?**
**a. Functional Groups in Molecule C:**
- Molecule C appears to contain carbon-carbon triple bonds (alkyne functional groups).
**b. Expected Stretches in IR:**
- C≡C stretch: Around 2100-2260 cm⁻¹.
- C-H stretch (associated with terminal alkynes): Around 3300 cm⁻¹.
**c. Differentiating C from A:**
- Molecule C can be distinguished from molecule A by the presence of peaks related to C≡C, which are absent in molecule A’s spectrum. Molecule A is more likely to have a strong, broad O-H stretch around 3200-3550 cm⁻¹ and a strong C=O stretch near 1700 cm⁻¹.
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