Final answer:
The family of molecules that contain sulfhydryl groups is c) Thiols. Thiols are analogs of alcohols with a sulfur atom replacing the oxygen atom, and they are named using the alkane name with the suffix '-thiol'.
Step-by-step explanation:
Sulfhydryl groups are characterized by the presence of a thiol group. Thus, the family of molecules that contain sulfhydryl groups is c) Thiols. Thiols are sulfur analogs of alcohols and contain an electrophilic carbon atom that is attached to a sulfur atom with an acidic hydrogen (R-SH). For example, methanethiol has the chemical formula CH3-SH, making it an analog of methyl alcohol. Thiols, similar to alcohols, are named by using the alkane name with the suffix '-thiol'. In biological contexts, thiols are important as they can form disulfide bonds (R-S-S-R), which are crucial in protein structure, seen when two cysteine amino acids form such a bond.