Yes, it's a thiol.
https://www.livescience.com/39248-what-is-mustard-gas.html
https://www.livescience.com/39248-what-is-mustard-gas.html
To determine the functional group of mustard gas or any other compound, you can follow these steps:
1. Identify the compound: In this case, the compound is mustard gas or sulfur mustard.
2. Analyze the molecular structure: Look for specific groups of atoms in the molecule. In the case of mustard gas, you can identify the sulfur atom (S) attached to two alkyl groups (usually methyl, CH3-) and a chlorine atom (Cl).
3. Consult a functional group chart or database: Use reliable sources such as organic chemistry textbooks, online databases, or chemical reference books to identify the functional group based on the molecular structure. In this case, mustard gas belongs to the functional group of alkylating agents or mustards.
Remember, it is essential to have a good understanding of organic chemistry and its principles to accurately identify functional groups in compounds.