See image — Hydrocarbons Chemistry Question

💡 Solution & Explanation

Correct option: \(\text{B}\). Preparation methods are selected by the target hydrocarbon: elimination forms alkenes/alkynes, reduction gives more saturated products, and coupling reactions build larger carbon skeletons. Recovered question text: 28. The disappearance of the charactheristic purple colour of KMnO in its reaction with an alkene is the test for 4 unsaturation. It is known as : (A) Maqrkownikoffs test (B) Baeyer’s test (C) Wurtz test (D) Grignard test 163