Question

Reaction of $2$-methylbuta-$1, 3$-diene with $O _{3}$ and $Zn - H _{2} O$, gives

• A. $CH _{3} COCH _{3}+2 CO _{2}$
• B. $CH _{3} COCHO +2 HCHO$
• C. $CH _{3} COCHO +2 HCO _{2} H$
• D. $CH _{3} CO _{2} H +3 HCO _{2} H$

Answer 1

Answer: (B)

On ozonolysis of $2$ -methyl buta- $1,3$ -diene with $O_{3}$ and $Zn - H _{2} O$ cleave both $C=C$ and convert them to carbonyl groups. Hence,
$2$ -methyl buta- $1,3$ -diene $\xrightarrow [Zn - H_2O ]{O_3}\underset{\text{Product(s)}}{CH _{3} CHO +2 H \cdot CHO}$