Synthetic detergents have an advantage over usual soaps regarding cleansing power. However,the long-term use of synthetic detergents creates environmental pollution. How can the pollution caused by synthetic detergents be minimized? Classify the detergents according to their chemical nature.

(N/A) $1$. Minimizing Pollution: Pollution caused by synthetic detergents can be minimized by using biodegradable detergents. Detergents with highly branched hydrocarbon chains are non-biodegradable and accumulate in the environment. Therefore,using detergents with straight-chain hydrocarbons allows microorganisms to easily degrade them.
$2$. Classification of Detergents:
$(i)$ Anionic Detergents: These are sodium salts of sulfonated long-chain alcohols or hydrocarbons. Example: Sodium lauryl sulfate $(CH_3(CH_2)_{10}CH_2OSO_3^-Na^+)$.
(ii) Cationic Detergents: These are quaternary ammonium salts of amines with acetates,chlorides,or bromides. Example: Cetyltrimethylammonium bromide.
(iii) Non-ionic Detergents: These do not contain any ions. They are formed by the reaction of stearic acid with polyethylene glycol. Example: Liquid dishwashing detergents.