Benzene on ozonolysis followed by reaction with Zn + H2O gives:
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Ozonolysis of aromatic compounds like benzene is a powerful method to cleave the entire aromatic ring. The type of workup (reductive or oxidative) determines the final product. A reductive workup (e.g., $\text{Zn}/\text{H}_2\text{O}$ or $\text{Me}_2\text{S}$) yields aldehydes, while an oxidative workup (e.g., $\text{H}_2\text{O}_2$) yields carboxylic acids.