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: 8. The pH of solution in Kolbe's electrolysis (1) Increase with time (2) Decrease with time (3) Remains constant (4) Nothing can be said