4.) a.) Given that the condensed molecular formula for the following compound, CSH120, predict the bonds you would expect this molecule to have based on the given IR spectrum. Draw arrows to the peaks with the bond(s) they represent. b.) Based on your findings from the IR spectrum, propose 3 different constitutional isomers that are consistent with your findings.

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### Infrared Spectroscopy Analysis of the Compound C\(_5\)H\(_{12}\)O

**Question 4:**

**a)** Given that the condensed molecular formula for the following compound is C\(_5\)H\(_{12}\)O, predict the bonds you would expect this molecule to have based on the given IR spectrum. Draw arrows to the peaks with the bond(s) they represent.

**b)** Based on your findings from the IR spectrum, propose 3 different constitutional isomers that are consistent with your findings.

#### IR Spectrum Description

The infrared (IR) spectrum graph shows the intensity of absorption (Y-axis) as a function of wavenumber (X-axis) in cm\(^{-1}\). The analysis can identify functional groups within a molecule based on their characteristic absorption frequencies.

##### Key Observed Peaks:
1. **Broad peak around 3346 cm\(^{-1}\)**
   - **Interpretation**: This is indicative of an O-H stretching vibration, which suggests the presence of an alcohol (OH group).

2. **Sharp peaks around 3000 cm\(^{-1}\)**
   - **Interpretation**: These peaks are typical of C-H stretching vibrations, suggesting the presence of C-H bonds which are expected in alkyl groups (CH\(_3\), CH\(_2\), CH).

3. **Peaks around 1465-1390 cm\(^{-1}\)**
   - **Interpretation**: These peaks could correspond to C-H bending vibrations (methyl or methylene groups).

##### Summary:
Based on the IR spectrum, the significant broad peak around 3346 cm\(^{-1}\) for O-H stretching indicates the presence of an alcohol functional group. The absorptions around 3000 cm\(^{-1}\) imply the presence of alkane C-H bonds.

#### Proposed Constitutional Isomers:
Considering the molecular formula C\(_5\)H\(_{12}\)O and the identified functional groups, three possible isomers are:

1. **1-Pentanol** \(\mathbf{CH_3(CH_2)_4OH}\)
2. **2-Pentanol** \(\mathbf{CH_3CH(OH)CH_2CH_2CH_3}\)
3. **3-Pentanol** \(\mathbf{CH_3CH_2CH(OH)CH_2CH_
Transcribed Image Text:### Infrared Spectroscopy Analysis of the Compound C\(_5\)H\(_{12}\)O **Question 4:** **a)** Given that the condensed molecular formula for the following compound is C\(_5\)H\(_{12}\)O, predict the bonds you would expect this molecule to have based on the given IR spectrum. Draw arrows to the peaks with the bond(s) they represent. **b)** Based on your findings from the IR spectrum, propose 3 different constitutional isomers that are consistent with your findings. #### IR Spectrum Description The infrared (IR) spectrum graph shows the intensity of absorption (Y-axis) as a function of wavenumber (X-axis) in cm\(^{-1}\). The analysis can identify functional groups within a molecule based on their characteristic absorption frequencies. ##### Key Observed Peaks: 1. **Broad peak around 3346 cm\(^{-1}\)** - **Interpretation**: This is indicative of an O-H stretching vibration, which suggests the presence of an alcohol (OH group). 2. **Sharp peaks around 3000 cm\(^{-1}\)** - **Interpretation**: These peaks are typical of C-H stretching vibrations, suggesting the presence of C-H bonds which are expected in alkyl groups (CH\(_3\), CH\(_2\), CH). 3. **Peaks around 1465-1390 cm\(^{-1}\)** - **Interpretation**: These peaks could correspond to C-H bending vibrations (methyl or methylene groups). ##### Summary: Based on the IR spectrum, the significant broad peak around 3346 cm\(^{-1}\) for O-H stretching indicates the presence of an alcohol functional group. The absorptions around 3000 cm\(^{-1}\) imply the presence of alkane C-H bonds. #### Proposed Constitutional Isomers: Considering the molecular formula C\(_5\)H\(_{12}\)O and the identified functional groups, three possible isomers are: 1. **1-Pentanol** \(\mathbf{CH_3(CH_2)_4OH}\) 2. **2-Pentanol** \(\mathbf{CH_3CH(OH)CH_2CH_2CH_3}\) 3. **3-Pentanol** \(\mathbf{CH_3CH_2CH(OH)CH_2CH_
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