Oxidation of alkenes by cleavage with acidic or alkaline $KMn{O}_4$ or acidic $K_{2}C{r}_2{O}_7$ at higher temperature yields products depending upon the nature of alkene. A hot solution of is a strong oxidizing agent which gives only ketones and carboxylic acids and not aldehydes

Oxidation of alkenes with ${\mathrm{OsO}}_4$ followed by hydrolysis yields glycols