Question

Complete the following reaction

Answer 1

In the 1st step electrophilic addition of $3$ moles of $O_3$ to the three carbon-carbon double bonds of mesitylene to form unstable mesitylene triozonide which is further converted to mesitylene triozonide. After that reductive hydrolysis by $Zn$ to form $3$ moles of $2-Oxopropanal$.