Question

Which of the following compounds forms \(4\)-Methylpent-\(3\)-en-\(2\)-one by aldol condensation on further dehydration.

• A. Two molecules of acetone
• B. Two molecules of acetaldehyde
• C. Acetaldehyde and formaldehyde
• D. Acetaldehyde and acetone

Hint:

Two molecules of acetone undergo aldol condensation and then dehydrate to mesityl oxide.

Answer 1

The Correct Option is A

Step 1: Count Carbons
The product has 6 carbons, so the reactants must add up to 6.

Step 2: Test the Options
Acetaldehyde and formaldehyde give a 3-carbon product; two acetaldehyde give 4 carbons; acetaldehyde and acetone give 5 carbons.

Step 3: Select
Only two acetone molecules give 6 carbons and the methyl-substituted alkene, option (A).

Final Answer:
Self-condensation of acetone gives the compound, option (A). \[ \boxed{\text{(A) }\text{Two molecules of acetone}} \]