Determine the compound (name or structure) from the data. Explain features from each data. Molecular formula: C6H5Br Use molecular formula to determine IHD IR: Identify the presence/absence of five key functional groups NMR: Analyze this last. Consider multiplicity and peak area to confirm compound. The 5 H peak area covers both peaks (at 7.1 and 7.5 ppm Structure?
Determine the compound (name or structure) from the data. Explain features from each data. Molecular formula: C6H5Br Use molecular formula to determine IHD IR: Identify the presence/absence of five key functional groups NMR: Analyze this last. Consider multiplicity and peak area to confirm compound. The 5 H peak area covers both peaks (at 7.1 and 7.5 ppm Structure?
Determine the compound (name or structure) from the data. Explain features from each data. Molecular formula: C6H5Br Use molecular formula to determine IHD IR: Identify the presence/absence of five key functional groups NMR: Analyze this last. Consider multiplicity and peak area to confirm compound. The 5 H peak area covers both peaks (at 7.1 and 7.5 ppm Structure?
Determine the compound (name or structure) from the data. Explain features from each data.
Molecular formula: C6H5Br
Use molecular formula to determine IHD
IR: Identify the presence/absence of five key functional groups
NMR: Analyze this last. Consider multiplicity and peak area to confirm compound.
The 5 H peak area covers both peaks (at 7.1 and 7.5 ppm
Structure?
Transcribed Image Text:**NMR Spectrum Explanation**
The image presents a Nuclear Magnetic Resonance (NMR) spectrum, which is a commonly used technique in chemistry for determining the structure of organic compounds.
**Graph Description:**
- **Horizontal Axis (x-axis):** The horizontal axis is labeled "ppm," which stands for "parts per million." This axis represents the chemical shifts, indicating the environment of the hydrogen atoms in the sample. The scale ranges from 0 to 10 ppm in this spectrum.
- **Vertical Axis (y-axis):** This axis does not have a specific label in the given image, but it typically represents the intensity of the peaks, correlating to the relative number of hydrogen atoms corresponding to each signal.
- **Peaks and Signals:**
- The spectrum features a series of peaks located between approximately 6.5 and 8 parts per million (ppm).
- At the very top of the peak, there is a label "5 H," indicating that the signal corresponds to five hydrogen atoms.
- **Additional Information:**
- The bottom left corner contains "HPM-01-029," which is likely an identifier or reference number for the sample or spectrum.
**Interpreting the Spectrum:**
The position of the peaks (chemical shifts) gives information about the hydrogen atom's chemical environment in the molecule. In this spectrum:
- The peaks are clustered between 6.5 and 8 ppm, suggesting the hydrogen atoms are in an aromatic environment, commonly seen in benzene-like structures.
- The label "5 H" indicates that these peaks represent five hydrogen atoms, which is typical for monosubstituted benzene rings, where five hydrogen atoms are attached to the benzene ring.
Understanding NMR spectra is essential for identifying the structure of organic compounds. By analyzing the chemical shifts and the number of hydrogen atoms each peak represents, chemists can deduce the molecular structure and determine the functional groups present in the molecule.
Transcribed Image Text:**Infrared Spectroscopy (IR) Graph Analysis**
**Description:**
The image displays an infrared (IR) spectroscopy graph, often used in chemistry for analyzing molecular composition. The graph plots transmittance (%) on the y-axis versus wavenumber (cm⁻¹) on the x-axis.
**Key Components:**
1. **Y-Axis: Transmittance (%)**
- This axis shows the percentage of infrared light transmitted through the sample. A value of 100% indicates no absorption at that particular wavenumber, while 0% means complete absorption.
2. **X-Axis: Wavenumber (cm⁻¹)**
- The wavenumber denotes the number of wavelengths per centimeter and is inversely proportional to wavelength (λ). It provides a direct correlation with the energy of the vibrational modes of the molecules.
3. **Graph Features:**
- The graph line fluctuates, creating peaks and troughs.
- Peaks correspond to specific wavelengths where the sample absorbs infrared light, indicative of different vibrational modes of the molecules in the sample.
- The depth and position of each peak provide insights into the functional groups and molecular structure present in the sample.
**Detailed Description of the Graph:**
- **High Wavenumber Region (4000-3000 cm⁻¹):**
- Exhibits broad peaks indicating O-H and N-H stretching vibrations typically found in alcohols, carboxylic acids, and amines.
- **Middle Wavenumber Region (3000-1500 cm⁻¹):**
- Contains multiple peaks, often associated with C-H stretching vibrations in alkanes (2850-2960 cm⁻¹), C=O stretching in carbonyl compounds (around 1700 cm⁻¹), and C=C stretching in alkenes (around 1600 cm⁻¹).
- **Low Wavenumber Region (1500-500 cm⁻¹):**
- Known as the fingerprint region, this area is dense with peaks that are unique to individual molecules. Peaks here can indicate bending vibrations, C-O stretching in ethers and esters, and various other functional groups.
**Analysis Usage:**
- By analyzing the position and intensity of the absorption peaks, chemists can infer the presence of specific functional groups and, consequently, deduce the molecular structure of the compound in the sample. This information is crucial for identifying unknown substances
Definition Definition Group of atoms that shape the chemical characteristics of a molecule. The behavior of a functional group is uniform in undergoing comparable chemical reactions, regardless of the other constituents of the molecule. Functional groups aid in the classification and anticipation of reactivity of organic molecules.
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