Chemistry - GOC Question with Solution | TestHub

The increasing order of the rate of $\mathrm{HCN}$ addition to compounds $\mathrm{A}-\mathrm{D}$ is (A) $\mathrm{HCHO}$ (B) ${\mathrm{CH}}_3{\mathrm{COCH}}_3$ (C) ${\mathrm{PhCOCH}}_3$ (D) PhCOPh