Match the four structures with the four IR spectra (by putting a proper letter in the box to the right of each spectrum). Use specific IR absorptions for various functional groups to identify the structures. Circle the important peaks in each spectrum that helped you identify the functional group(s) and label the functional group beside it

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Match the four structures with the four IR spectra (by putting a proper letter in the box to the right of each spectrum). Use specific IR absorptions for various functional groups to identify the structures. Circle the important peaks in each spectrum that helped you identify the functional group(s) and label the functional group beside it

**Infrared (IR) Spectroscopy Analysis**

The image displays four sets of chemical structures labeled A, B, C, and D at the top, each corresponding to different compounds. Below these structures, there are four infrared (IR) spectra graphs, each corresponding to one of these compounds. The infrared spectra display the % Transmittance on the y-axis against the Wavenumbers (cm^-1) on the x-axis, which range from 4000 cm^-1 to 500 cm^-1.

### Chemical Structures
**A.**
- Chemical Structure: Propylamine
- Functional groups: Amine group (NH2)

**B.**
- Chemical Structure: Cyclohexanone
- Functional groups: Ketone (C=O)

**C.**
- Chemical Structure: Benzaldehyde
- Functional groups: Aldehyde (CHO)

**D.**
- Chemical Structure: Thymol
- Functional groups: Phenolic hydroxyl group (OH), aromatic ring

### IR Spectra Analysis

#### First Graph
The first IR spectrum corresponds to one of the compounds. Key peaks visible in this spectrum include:
- ~3300 cm^-1: N-H stretching (amine)
- ~2980 cm^-1: C-H stretching (alkane or alkyl group)
- ~1600 cm^-1: N-H bending (amine)

#### Second Graph
The second IR spectrum corresponds to another compound. Key peaks include:
- ~1710 cm^-1: C=O stretching (ketone)
- ~2900 cm^-1: C-H stretching (alkane)
- ~1300-1100 cm^-1: C-O stretching

#### Third Graph
The third IR spectrum is aligned with another compound. Key peaks include:
- ~1700 cm^-1: C=O stretching (aldehyde)
- ~2900 cm^-1: C-H stretching
- ~2700-2800 cm^-1: C-H stretching (Aldehyde C-H stretch)

#### Fourth Graph
The fourth IR spectrum corresponds to the final compound. Key peaks include:
- ~3600-3200 cm^-1: O-H stretching (alcohol/phenol)
- ~1600-1475 cm^-1: C=C stretching (aromatic)

### Explanation of Graph Components:
- **% Transmittance:** Indicates the percentage of infrared light that passes through the sample.
- **Waven
Transcribed Image Text:**Infrared (IR) Spectroscopy Analysis** The image displays four sets of chemical structures labeled A, B, C, and D at the top, each corresponding to different compounds. Below these structures, there are four infrared (IR) spectra graphs, each corresponding to one of these compounds. The infrared spectra display the % Transmittance on the y-axis against the Wavenumbers (cm^-1) on the x-axis, which range from 4000 cm^-1 to 500 cm^-1. ### Chemical Structures **A.** - Chemical Structure: Propylamine - Functional groups: Amine group (NH2) **B.** - Chemical Structure: Cyclohexanone - Functional groups: Ketone (C=O) **C.** - Chemical Structure: Benzaldehyde - Functional groups: Aldehyde (CHO) **D.** - Chemical Structure: Thymol - Functional groups: Phenolic hydroxyl group (OH), aromatic ring ### IR Spectra Analysis #### First Graph The first IR spectrum corresponds to one of the compounds. Key peaks visible in this spectrum include: - ~3300 cm^-1: N-H stretching (amine) - ~2980 cm^-1: C-H stretching (alkane or alkyl group) - ~1600 cm^-1: N-H bending (amine) #### Second Graph The second IR spectrum corresponds to another compound. Key peaks include: - ~1710 cm^-1: C=O stretching (ketone) - ~2900 cm^-1: C-H stretching (alkane) - ~1300-1100 cm^-1: C-O stretching #### Third Graph The third IR spectrum is aligned with another compound. Key peaks include: - ~1700 cm^-1: C=O stretching (aldehyde) - ~2900 cm^-1: C-H stretching - ~2700-2800 cm^-1: C-H stretching (Aldehyde C-H stretch) #### Fourth Graph The fourth IR spectrum corresponds to the final compound. Key peaks include: - ~3600-3200 cm^-1: O-H stretching (alcohol/phenol) - ~1600-1475 cm^-1: C=C stretching (aromatic) ### Explanation of Graph Components: - **% Transmittance:** Indicates the percentage of infrared light that passes through the sample. - **Waven
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