An unknown compound X has the molecular formula C₁₀H₁₁O₂Br.Compound X shows a strong absorption in its IR spectrum at 1700 cm^-1.The ¹H NMR spectral data for compound X is given below.What is the structure of compound X?

Question

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- The molecular formula gives us information about the number and type of atoms present in the compound. In this case, we have 1 C, 4 S, 4 U, 4 B, 1 H, 1 O, and 1 Br. - The strong absorption at 1700 cm-1 in the IR spectrum suggests the presence of a carbonyl group (C=O). - Looking at the ¹H NMR data, we can see a singlet at around 2.2 ppm (integration of 3H), which could correspond to a methyl group attached to the carbonyl carbon. This would be consistent with the molecular formula. - The NMR data also shows a singlet at around 8.2 ppm (integration of 1H), which could be attributed to a hydrogen attached to a heteroatom, such as oxygen or nitrogen. However, we do not see any oxygen or nitrogen atoms in the molecular formula, so this signal is likely due to exchangeable protons, such as the hydroxyl group (OH) in a carboxylic acid or the amine group (NH) in an amide. - Based on the above information, there are two possible structures for compound X: I) a carboxylic acid with the formula RCOOH, or II) an amide with the formula RCONHR'. Both structures have a carbonyl group, a methyl group, and an exchangeable proton. The difference is that in structure I, the exchangeable proton comes from the hydroxyl group (-OH) attached to the carbonyl carbon, while in structure II, the exchangeable proton comes from the amine group (-NH) attached to the carbonyl carbon. - We cannot distinguish between structures I and II based on the given data, so the answer is D: either I or II is a possible structure for compound X.

An Unknown Compound X Has the Molecular Formula C10H11O2Br

An Unknown Compound X Has the Molecular Formula C₁₀H₁₁O₂Br