An infrared spectrum of an organic compound is shown - HSC - SSCE Chemistry - Question 4 - 2024 - Paper 1

To determine which compound corresponds to the given infrared spectrum, we will analyze the key absorption peaks in the spectrum.

1. Analyzing the Spectrum: The significant peaks to note in the spectrum are typically around:

   • 3300–3500 cm^-1: This range indicates the presence of an -OH group (alcohol or phenol).
   • 1700–1750 cm^-1: This range typically indicates a carbonyl group (C=O), such as in ketones or aldehydes.

2. Evaluating the Options:

   • Compound A: Has an -OH group, which would correspond to the peak around 3300-3500 cm^-1.
   • Compound B: Contains a carbonyl group (C=O), which would give an absorption in the region of 1700-1750 cm^-1.
   • Compound C: Similar to B, it contains a carbonyl group.
   • Compound D: Is a simple hydrocarbon without functional groups that would create distinctive peaks in the analyzed range.

From the analysis above, Compound A is the most representative because it acknowledges the -OH functional group, which is crucial based on the prominent peak observed in the IR spectrum.