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Among the following compounds, which one produces ONLY oxalic acid (HOOC-COOH) as the major product when treated with O3 followed by H2O2?

1. Cyclohexa-1,3-diene
2. Benzene
3. Ethene (H2C=CH2)
4. Cyclobutene

Correct answer: Benzene

Solution

Ozonolysis of benzene breaks all three double bonds to give three molecules of glyoxal (OHC-CHO). Oxidation by H2O2 converts each glyoxal into oxalic acid (HOOC-COOH), making benzene the unique compound that yields ONLY oxalic acid. Other options produce formic acid (ethene -> formaldehyde -> formic acid), succinic acid (cyclobutene), or a mixture of products (cyclohexadiene).

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