MHT CET Chemistry Question (2026) — Solution

Step-by-step solution

Baeyer's reagent is a cold, dilute, alkaline solution of potassium permanganate (KMnO_4). It is a strong oxidizing agent, but its primary application in qualitative organic analysis is to test for unsaturation. When Baeyer's reagent reacts with an organic compound containing a carbon-carbon double bond (alkene) or triple bond (alkyne), the purple colour of the permanganate solution disappears and a brown precipitate of manganese dioxide (MnO_2) is formed. Therefore, it is used for detecting the presence of carbon-carbon double bonds. Answer: Detecting the presence of carbon carbon double bond.