Anionic detergents have a negatively charged hydrophilic head. Sodium lauryl sulphate ($CH_3(CH_2)_{11}OSO_3^- Na^+$) has an anionic sulphate group → anionic detergent. Cetyltrimethylammonium bromide has a cationic nitrogen → cationic detergent. Glyceryl oleate is a nonionic detergent. Sodium stearate ($C_{17}H_{35}COO^-Na^+$) is a soap, not a synthetic detergent.