How to convert phenol to benzoquinone?

Phenol on oxidation with potassium dichromate in acidic medium gives benzoquinone.

C₆H₆O + 2[O] → C₄H₄O₂ + H₂O

The reagents used for the oxidation is K₂Cr₂O₇ + H₂SO₄

Other reagents which can be used are

1) acidic. Na₂Cr₂O₇
2) alkaline. KMnO₄
3) Jones reagent
4) Cr₂O₂Cl₂

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