An organic compound is analyzed and found to contain 66.7%...

An organic compound is analyzed and found to contain 66.7$\%$ carbon, 11.2$\%$ hydrogen, and 22.1$\%$ oxygen by mass. The compound boils at $79.6^{\circ} \mathrm{C} .$ At $100^{\circ} \mathrm{C}$ and 0.970 atm, the vapor has a density of 2.28 $\mathrm{g} / \mathrm{L} .$ The compound has a carbonyl group and cannot be oxidized to a carboxylic acid. Suggest a structure for the compound.

Key Concepts

Identification of Functional Groups

Recognizing the presence of a carbonyl group is crucial, as it helps narrow down potential structures. Understanding that compounds with carbonyl groups can belong to different classes—such as aldehydes, ketones, or carboxylic acids—allows one to eliminate those that can be oxidized to carboxylic acids (like aldehydes), thus suggesting a ketone.

Molecular Structure Determination

This integrates the empirical formula, molecular weight estimation, and functional group analysis to propose a specific molecular structure. By correlating these pieces of evidence, one can suggest a structure that fits both the compositional and physical data.

Empirical Formula Determination

This concept involves converting the mass percentages of elements into their mole ratios to deduce the simplest whole-number formula, which serves as a starting point for identifying the compound’s molecular formula.

Use of the Ideal Gas Law and Vapor Density

By applying the ideal gas law (PV = nRT) to data on vapor density, one can calculate the molar mass of a vapor. This measurement confirms the molecular weight computed from the empirical formula, refining the structure determination.

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