Q). The chemical that undergoes self oxidation and self reduction in the same reaction is  (a) benzyl alcohol  (b) acetone  (c) formaldehyde  (d) acetic acid

Dear Student,

Self oxidation and self reduction in the same reaction i.e. disproportionation occurs in case of Cannizzaro reaction. It is given by aldehydes having no α-hydrogen. Therefore, the correct answer is (c) formaldehydeHCHO +HCHOOH- CH3OH + HCOOH

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The required compound is (c) Formaldehyde. 
The reaction is called Self Cannizzaro Reaction...
Here, when HCHO is heated in the presence of NaOH/KOH, formaldyhyde gets reduced to CH3OH... and is oxidised to HCOONa...

Hope this helps.....
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