Question

$\mathrm{CH}{}_2=\mathrm{CH}{}_2\underset{(2)\mathrm{Zn}/\mathrm{H}{}_2\mathrm{O}}{\overset{(1)\mathrm{O}{}_3}{\to }}\mathrm{A}\underset{\mathrm{NaOH}}{\overset{\mathrm{conc}\cdot }{\to }}\underset{\text{ alcohol }}{B}+\underset{\text{ sodium salt of carboxylic acid}}{C}$
The reaction of $A$ to give $B$ and $C$ is an example of

• A. HVZ reaction
• B. Stephen reaction
• C. Etard reaction
• D. Cannizaro reaction

Answer 1

Answer: (D)

In the given sequence of reaction $A$ is $HCHO$ (formaldehyde) which undergoes Cannizzaro reaction in presence of conc. $NaOH$ to give methanol $(B)$ and sodium formate $(C)$ . The complete reaction is as follows:

$\underset{\text{Ethene}}{C{H}_2=C{H}_2}\underset{\text{Ozonolysis}}{\overset{\mathrm{O}{}_3/\mathrm{Zn},\mathrm{H}{}_2\mathrm{O}}{\to }}\underset{\stackrel{\text{Formaldehyde}}{(A)}}{2HCHO}\underset{\text{Cannizzaro reaction}}{\overset{\mathrm{Conc}\cdot \mathrm{NaOH},\mathrm{D}}{\to }}$