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Dioxygen from KClO3: In the laboratory, potassium chlorate is heated with a small amount of manganese dioxide (MnO2) as catalyst (about 420 K); oxygen is evolved and collected by downward displacement of water.

2KClO3(s) —(MnO2, Δ)→ 2KCl(s) + 3O2(g)

(a) Phenol to benzoquinone: Oxidation with sodium dichromate and sulphuric acid (chromic acid):

C6H5OH —(Na2Cr2O7, H2SO4)→ O=C6H4=O (p-benzoquinone)

(b) Phenol to cyclohexanol: Catalytic hydrogenation:

C6H5OH + 3H2 —(Ni, 433 K)→ C6H11OH (cyclohexanol)

Doubtly AI · 29 Oct 2026 AI-verified · Nov 2026 Report
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