Question

Assertion A : Enol form of acetone $\left[C{H}_{3}COC{H}_3\right]$ exists in < 0.1% quantity. However, the enol form of acetyl acetone $\left[C{H}_{3}COC{H}_{2}OCC{H}_3\right]$ exists in approximately 15% quantity.

Reason R : Enol form of acetyl acetone is stabilized by intermolecular hydrogen bonding, which is not possible in enol form of acetone.

Choose the correct statement :

• A. A is true but R is false
• B. Both A and R are true and R is the correct explanation of A
• C. A is false but R is true
• D. Both A and R true but R is not the correct explanation of A

Answer 1

The correct option is B Both A and R are true and R is the correct explanation of A


Acetyl acetone in enol form have intramolecular H-bonding, which is absent in acetone.
Hence, enol formed from acetyl acetone is more stable than enol form of acetone.
Hence, option (b) is the correct answer.