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Which of the following characteristics is shared by more than one of the four compounds listed?

1. Display resonance as a result of conjugated bonds in their structure
2. React positively with sodium bicarbonate (NaHCO3)
3. Possess a ring-shaped molecular structure
4. Form a precipitate with 2,4-dinitrophenylhydrazine (2,4-DNP)

Correct answer: React positively with sodium bicarbonate (NaHCO3)

Solution

A positive sodium bicarbonate test is shown by compounds containing sufficiently acidic carboxylic acid groups, and this can apply to more than one compound in a set. The other properties are usually more specific or less commonly shared across the four compounds.

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