Chemistry - Carbonyl compounds Question with Solution | TestHub

In the given reaction sequence

${\text{CH}}_3\text{CHO}\underset{\left(\text{ii}\right){\text{H}}_{\text{3}}{\text{O}}^{+}}{\overset{\left(\text{i}\right)\text{NaCN}/\text{HCl}}{\to }}\left(\text{A}\right)\underset{\text{reagent}}{\overset{\text{Fenton}}{\to }}\left(\text{B}\right)$,

B will be