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  4. The chemical that undergoes self oxidation and self reduction in the same reaction is

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Q. The chemical that undergoes self oxidation and self reduction in the same reaction is

Redox Reactions

Solution:

Formaldehyde $(HCHO)$ is reduced to $CH _{3} OH$ and is also oxidised to $HCOOH$ in Cannizzaro's reaction in the presence of an alkali ($NaOH$ solution) -disproportionation.
$2 HCHO + NaOH (5 \%) \rightarrow CH _{3} OH + HCOONa$