$\mathrm{PhCHOHCH}_{3}+4 \mathrm{I}_{2}+6 \mathrm{NaOH} \stackrel{\Delta}{\longrightarrow} $$\mathrm{CHI}_{3}+\mathrm{PhCOONa}+5 \mathrm{NaI}+5 \mathrm{H}_{2} \mathrm{O}$
${C_2}{H_5}OC_2{H_5} + 4\left[ H \right]\xrightarrow{{brown\,\,P + HI}}2X + {H_2}O$