These are my peaks for isopentyl acetate IR spectrum, what functional groups are they: ex.) C-H, C-H2, C-H3, C=0, C-O, O-H etc 2958 2872 1739 1465 1387 1366 1227 1171 1055 1029
The Correct Answer and Explanation is:
For the isopentyl acetate IR spectrum, the peaks correspond to the following functional groups based on their typical wavenumbers:
- 2958 cm⁻¹: This peak is likely from C-H stretching vibrations in alkyl groups, specifically the methyl (CH₃) or methylene (CH₂) groups. This region (2850-2960 cm⁻¹) is typical for C-H stretches in alkyl chains.
- 2872 cm⁻¹: This is another peak indicative of C-H stretching from the methyl (CH₃) or methylene (CH₂) groups. The slight shift is due to different environments in the molecule.
- 1739 cm⁻¹: This peak corresponds to the C=O stretch of an ester functional group. Isopentyl acetate, being an ester, has a carbonyl group (C=O), and its stretching vibration typically appears around 1735-1750 cm⁻¹. The exact position can vary based on the structure of the ester.
- 1465 cm⁻¹: This is indicative of C-H bending or CH₂/CH₃ deformation in alkyl groups, especially in the methylene (CH₂) or methyl (CH₃) groups.
- 1387 cm⁻¹: This is another peak for C-H bending, likely from methyl groups (CH₃) in the molecule. These bending modes are commonly observed around this wavenumber.
- 1366 cm⁻¹: Another peak for C-H bending, typically from methyl groups or methylene (CH₂) groups.
- 1227 cm⁻¹: This is a peak likely corresponding to the C-O stretch in the ester group. The ester’s C-O bond typically shows stretching around 1000-1300 cm⁻¹.
- 1171 cm⁻¹: This is likely another C-O stretching vibration, typical for esters and alcohols.
- 1055 cm⁻¹: This is another C-O stretch, further confirming the presence of the ester group. It typically appears around 1000-1100 cm⁻¹.
- 1029 cm⁻¹: This is also indicative of C-O stretching, common in esters, ethers, and alcohols. This confirms the presence of the ester functionality in isopentyl acetate.
In summary, the main functional groups in isopentyl acetate are:
- C-H (alkyl groups: CH₃, CH₂)
- C=O (ester carbonyl)
- C-O (ester linkage)
The peaks at 1739 cm⁻¹ and 1227-1029 cm⁻¹ are key indicators of the ester functional group, which is the primary characteristic of isopentyl acetate.
