Question

The product ‘A’ gives white precipitate when treated with bromine water. The product ‘B’ is treated with Barium hydroxide to give the product C. The compound C is heated strongly to form product D. The product D is

• A. 4-Methylpent-3-en-2-one
• B. But-2 enal
• C. 3-Methylpent-3-en-2-one
• D. 2-Methylbut-2-enal

Answer 1

The Correct Option is A

Let's break down the reaction step by step:

1. The starting compound is a methylstyrene derivative. The reaction with oxygen (O₂) indicates oxidation of the alkene to form a hydroxy ketone (product A).

2. The product A gives a white precipitate when treated with bromine water, which suggests the presence of a reactive alkene or phenol group. The alkene reacts with bromine, forming a dibromide.

3. The product B is treated with barium hydroxide to give product C, which indicates the formation of an alkene through dehydration.

4. Finally, compound C is heated, which suggests elimination of water, leading to the formation of alkenes.

The final product D is likely a methylpent-3-en-2-one, corresponding to Option A.