Below are the NMR spectra and molecular formulas of three molecules. Draw the complete structure in the boxes below. All the atoms in each molecule are closed shell (octets) and uncharged. Lack of IR data does not mean that a specific functional group is not present in the molecule.
Below are the NMR spectra and molecular formulas of three molecules. Draw the complete structure in the boxes below. All the atoms in each molecule are closed shell (octets) and uncharged. Lack of IR data does not mean that a specific functional group is not present in the molecule.
Question.) Below are the NMR spectra and molecular formulas of three molecules. Draw the complete structure in the boxes below. All the atoms in each molecule are closed shell (octets) and uncharged. Lack of IR data does not mean that a specific functional group is not present in the molecule.
Transcribed Image Text:**Transcription and Explanation of NMR Spectrum for C₇H₁₂O₂**
This image presents an NMR (Nuclear Magnetic Resonance) spectrum of the compound with the molecular formula C₇H₁₂O₂. The spectrum is labeled to indicate different chemical shifts and splitting patterns. Notably, there is a reference to a C=O stretch in the IR spectrum, suggesting the presence of a carbonyl group.
### Spectrum Details:
- **Chemical Shifts (δ, ppm)**:
- Around 6.0 ppm: Two doublet of triplets (dt), each signifying 1H, with a coupling constant (J) of 18 Hz, indicating a possible alkene proton.
- Around 3.4 ppm: A singlet (s), corresponding to 3H, likely indicating a methyl group adjacent to an electronegative atom such as oxygen.
- Around 2.3 ppm: A doublet (d), representing 2H, potentially an indication of methylene protons adjacent to a carbonyl group.
- Around 1.2 ppm: A doublet of quartets (dq), representing 2H, suggesting coupling between a CH2 group and adjacent methyl groups.
- Around 0.9 ppm: A triplet (t), representing 3H, most likely a terminal methyl group.
### Graph Description:
- **X-Axis**: Represents chemical shift in parts per million (PPM), which indicates the environment of protons within the molecule.
- **Y-Axis**: Indicates the intensity of the signals, corresponding to the number of hydrogen atoms contributing to each signal.
### Structural Considerations:
- The combination of chemical shifts and splitting patterns provides insights into the molecular structure, suggesting the presence of aliphatic and potentially unsaturated structures.
- The presence of a singlet at 3.4 ppm is characteristic of protons adjacent to an oxygen atom, possibly indicating that the compound contains an ester group.
- The C=O stretch (indicated by IR data mentioned in text) complements the NMR data by suggesting an ester or carbonyl functionality in the structure.
Since the structure is to be drawn based on this data, the attributes such as the C=O stretch and NMR signals guide the deduction of the exact structural formula of C₇H₁₂O₂.
**Note**: The structure should be drawn based on these
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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