Below is the IR spectrum for isoamyl acetate (banana oil)

Below is the IR spectrum for isoamyl acetate (banana oil). Which peaks correspond to functional groups present in isoamyl acetate?

The Correct Answer and Explanation is :

Isoamyl acetate, commonly known as banana oil, is an ester with the chemical formula C₇H₁₄O₂. Its infrared (IR) spectrum reveals several characteristic peaks corresponding to specific functional groups:

1. Carbonyl Stretching (C=O): A strong absorption band near 1740 cm⁻¹ indicates the presence of the ester carbonyl group. This peak is typical for esters and is a key feature in their IR spectra. citeturn0search0
2. C-H Stretching: Bands around 2960 cm⁻¹ correspond to C-H stretching vibrations of alkyl groups. These are common in organic compounds containing alkyl chains. citeturn0search0
3. C-H Bending: A band near 1370 cm⁻¹ is associated with C-H bending vibrations, further confirming the presence of alkyl groups. citeturn0search0
4. C-O Stretching: A medium-intensity band around 1240 cm⁻¹ corresponds to C-O stretching vibrations, characteristic of ester linkages. citeturn0search0

These peaks collectively confirm the ester functional group in isoamyl acetate. The strong C=O stretching band near 1740 cm⁻¹ is particularly indicative of ester compounds. citeturn0search1

In summary, the IR spectrum of isoamyl acetate exhibits characteristic peaks that correspond to the ester functional group, including the C=O stretching, C-H stretching and bending, and C-O stretching vibrations. These features are essential for identifying and confirming the presence of isoamyl acetate in a sample.