Oxidation of phenol to p-benzoquinone: reagent and product

1. A.
   Structure (a)
2. B.
   Structure (b)
3. C.
   Structure (c)
4. D.
   Structure (d)

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1. A.
   Concentrated $\mathrm{H_2SO_4}$
2. B.
   Dilute $\mathrm{H_2SO_4}$
3. C.
   $\mathrm{Na_2Cr_2O_7/H_2SO_4}$
4. D.
   $\mathrm{Cu}/573\ \mathrm{K}$

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