Final answer:
None of the given options include a pair with an element and a compound. All of the options (CH4, H2O, NaCl) are examples of compounds.
Step-by-step explanation:
In the question asked, element refers to a substance that cannot be broken down into simpler substances by chemical reactions, while a compound refers to a substance that is composed of two or more different elements chemically combined in a fixed proportion.
Looking at the options given, none of them include a pair with an element and a compound. All options (CH4, H2O, NaCl) are examples of compounds as they are made up of more than one element. The elements include Carbon (C), Hydrogen (H), Oxygen (O) and Sodium (Na) and Chloride (Cl). So the correct answer will be none of these.
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