Methane used for fuel and commonly called natural gas is odorless, but for safety it has a small quantity of foul-smelling methyl mercaptan (CH₃SH) added. The "mercaptan" functional group is most similar to which of the following?

Question

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The "mercaptan" functional group, also known as a thiol, is similar to an alcohol because both contain a hydroxyl-like group. In thiols, the oxygen in the hydroxyl group of alcohols is replaced by sulfur.

Methane Used for Fuel and Commonly Called Natural Gas Is