Question
Download Solution PDFThe major product formed in the following reaction is
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Acid-catalyzed acetal formation:
→ Formation of an acetal occurs when the hydroxyl group of a hemiacetal becomes protonated and is lost as water.
→ The carbocation that is produced is then rapidly attacked by a molecule of alcohol. Loss of the proton from the attached alcohol gives the acetal.
Mechanism:
→ In this firstly protonation of benzaldehyde will take place.
Then, nucleophilic attack by alcohol. At last deprotonation by water takes place.
→ Molecules that have an alcohol and a carbonyl can undergo an intramolecular reaction to form a cyclic hemiacetal.
The mechanism is shown below in the figure:
1. Protonation of carbonyl group
2. Nucleophilic attack by alcohol
Conclusion:
The correct answer is option 3.
Last updated on Jun 23, 2025
-> The last date for CSIR NET Application Form 2025 submission has been extended to 26th June 2025.
-> The CSIR UGC NET is conducted in five subjects -Chemical Sciences, Earth Sciences, Life Sciences, Mathematical Sciences, and Physical Sciences.
-> Postgraduates in the relevant streams can apply for this exam.
-> Candidates must download and practice questions from the CSIR NET Previous year papers. Attempting the CSIR NET mock tests are also very helpful in preparation.