What is the major product of the reaction of $\text{2-methylbut-2-ene}$ with ${\text{O}}_3$ followed by ${\text{Zn/H}}_2\text{O}$?

Solution

1. Ozonolysis involves the cleavage of the $\text{C=C}$ double bond.
2. The structure of $\text{2-methylbut-2-ene}$ is ${\text{(CH}}_3{)}_2{\text{C=CHCH}}_3$.
3. Cleavage at the double bond yields ${\text{(CH}}_3{)}_2\text{C=O}$ (acetone) and ${\text{CH}}_3\text{CHO}$ (acetaldehyde).
4. Hence the answer is (A).