JEE Main 20199 AprilEvening Shift
- Exam
- JEE Main
- Year
- 2019
- Date
- 9 April
- Shift
- Evening Shift
- Subject
- Chemistry
- Chapter
- Aldehydes and Ketones
JEE Main 2019 · 9 April · Evening Shift · Chemistry · Aldehydes and Ketones
In the following reaction carbonyl compound + MeOH HCl ⇌ acetal...
In the following reaction
carbonyl compound
Rate of the reaction is the highest for:
carbonyl compound
Rate of the reaction is the highest for:
Options
- AAcetone as substrate and methanol in stoichiometric amount
- BPropanal as substrate and methanol in excess
- CPropanal as substrate and methanol in stoichiometric amount
- D
Acetone as substrate and methanol in excess
Correct answer
B. Propanal as substrate and methanol in excess
Step-by-step solution
Acetal is form from the reaction of aldehyde with excess of
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.