38. Вещества, вступающие в реакцию друг с другом:

We need to identify a pair of substances that can react with each other. Let's consider the options: a) Ethene reacts with halogens (like chlorine) via addition. Methane is relatively unreactive under normal conditions. b) Propane can react with hydrogen in a reforming process, but typically requires high temperatures. c) Ethane can react with water at high temperatures, but it's not a common reaction. d) Propane reacts with chlorine in the presence of UV light via substitution. Ethene reacts with halogens. The question asks for substances reacting with each other. Ethene (an alkene) readily reacts with halogens (like chlorine) via addition. Propane reacts with chlorine via substitution.

Answer: г) Пропан и хлор.