All the reaction between following pairs will produce hydrogen gas, except — Hydrocarbons Chemistry Question

💡 Solution & Explanation

I notice the question mentions "except" and identifies option A as correct, but the pairs of reactants aren't provided in your question. To solve this properly, I need to see all the options (A, B, C, D, etc.) showing the pairs of substances. **General approach for this type of question:** Reactions that produce $H_2$ gas typically involve: - **Active metals** (like Na, K, Ca, Mg) reacting with **water** or **dilute acids** - **Less active metals** (like Zn, Fe) reacting with **dilute acids** or **hot alkali solutions** - Exceptions: Noble metals (Au, Pt) or very unreactive metals won't produce $H_2$ **Please provide the options**, and I'll identify which pair does NOT produce hydrogen gas by explaining: 1. Why the other pairs produce $H_2$ 2. Why the correct answer (A) does not produce $H_2$