The term "cacodyl group" refers to a group of atoms consisting of one arsenic atom and two methyl groups. This group is commonly used in organic chemistry as a precursor to a variety of other compounds. Synonyms for the cacodyl group include dimethylarsinic, cacodylic acid, and arsenobetaine. These compounds have different properties and uses, but they all contain the cacodyl group. In addition, related compounds with different groups attached to the arsenic atom are sometimes called cacodyl derivatives. Overall, understanding the cacodyl group and its various synonyms is important for anyone studying organic chemistry or working in related fields.