Each of the IR spectra shown below is the spectrum of one of the following compounds. Identify the compound that produced each spectrum.

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Verified step by step guidance

1. Examine the IR spectrum provided. Identify key absorption peaks and their corresponding wavenumbers. For example, look for peaks in the regions associated with functional groups such as O-H, N-H, C=O, and aromatic C-H stretches.
2. Analyze the broad peak around 3200-3500 cm⁻¹. This is indicative of N-H stretching vibrations, which suggests the presence of an amine group.
3. Look for a sharp peak near 1700 cm⁻¹. This corresponds to C=O stretching vibrations, which indicates the presence of a carbonyl group.
4. Check for peaks in the region of 1500-1600 cm⁻¹, which are characteristic of aromatic C=C stretching vibrations. This suggests the presence of an aromatic ring.
5. Compare the identified functional groups and structural features from the IR spectrum with the given compounds (i, ii, iii, iv). Match the spectrum to the compound that contains both an amine group, a carbonyl group, and an aromatic ring, which is compound ii.

Key Concepts

Infrared Spectroscopy (IR)

Infrared spectroscopy is an analytical technique used to identify molecular structures by measuring the absorption of infrared light by a compound. Different functional groups absorb characteristic wavelengths of IR radiation, resulting in a spectrum that can be analyzed to determine the presence of specific bonds and functional groups in a molecule.

Wavenumber

Wavenumber is a unit of measurement used in spectroscopy, defined as the number of wave cycles per unit distance, typically expressed in cm⁻¹. In IR spectroscopy, wavenumbers correspond to the energy levels of molecular vibrations, allowing chemists to identify specific functional groups based on their unique absorption peaks in the spectrum.

Functional Groups

Functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules. In IR spectroscopy, the presence of functional groups such as alcohols, carbonyls, and amines can be inferred from the distinct absorption bands observed in the spectrum, aiding in the identification of the compound.