Question

Which of the following is not intermediate in the acid catalysed reaction of benzaldehyde with 2 equivalent of methanol to give acetal?

• A. A
• B. B
• C. C
• D. D

Hint:

The reaction intermediates in acetal formation involve carbonyl groups and methanol, not ethers.

Answer 1

The Correct Option is C

Step 1: Understand the reaction mechanism.
In the reaction of benzaldehyde with methanol, the intermediate is formed by protonation and nucleophilic attack, but \( \text{H}_2\text{C} - \text{O} - \text{CH}_3 \) is not an intermediate in this reaction.
Step 2: Conclusion.
Thus, the intermediate that is not involved is \( \text{H}_2\text{C} - \text{O} - \text{CH}_3 \).
Final Answer: \[ \boxed{\text{H}_2\text{C} - \text{O} - \text{CH}_3} \]