Ozonolysis of benzene to glyoxal: reagent and product

1. A.
   conc. $\text{HNO}_3$
2. B.
   Ni
3. C.
   $\text{Zn} + \text{H}_2\text{O}$
4. D.
   Zn

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1. A.
   Benzoic acid
2. B.
   Benzaldehyde
3. C.
   Phenol
4. D.
   Glyoxal

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1. A.
   $\mathrm{O_3}$ followed by Fe and $\mathrm{H_2O_2}$
2. B.
   $\mathrm{O_3}$ followed by Zn and $\mathrm{H_2O}$
3. C.
   $\mathrm{H_2}$ with nickel at 473K
4. D.
   $\mathrm{KMnO_4}$

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