Correct Answer - B
When `alpha`-hydrogen is absent in carbo nyl group, those compound gives cannizaro reaction. This reaction show disproportionation the oxidation product is salt of carboxylic acid and reduced product is alcohol
`HCHO+HCHOoverset("KOH (conc.)")tounderset("Methyl alcohol")(CH_(3)OH)+HCOO^(-)K^(+)`