Question

Benzene on ozonolysis followed by reaction with $Zn+H_{2}O$ gives:

• A. 3 moles of glycerol
• B. 3 moles of glyoxal
• C. 3 moles of glyoxalic acid
• D. 3 moles of acetylene

Answer 1

Answer: (B)

3 moles of glyoxal

Reductive ozonolysis of benzene gives 3 moles of glyoxal.

$C$ atoms attached by $C=C$ double bond are converted to carbonyl groups.

In this reaction, 3 $C=C$ double bonds are broken.

Option B is correct.