NEET Chemistry Chemistry in Everyday Life Questions Solved

BOARD

Explain the following terms with suitable examples :                      (2 marks)

(a) Cationic detergents

(b) Anionic detergents

(a) Cationic detergents : They are quaternary ammonium salts of amines with acetates,

     chlorides or bromides as anions and the cationic part possess a long hydrocarbon chain, and a

     positive charge on nitrogen atom. Therefore they are called cationic detergents.

     Example :  Cetyltrimethyl ammonium bromide

                                                       

 

(b) Anionic detergents : Those detergents in which large part of their molecules are anions and

     used in cleansing action, are called anionic detergents.

     Example : Sodium alkyl sulphates

     These are obtained from long straight chain alcohols containing 12-18 carbon atoms by

     treatment with conc. H2SO4 followed by neutralization with NaOH.

     Example : Sodium lauryl sulphate.

             C11H23        CH2OHLauryl alcohol H2SO4Conc. C11H23CH2OSO3HLauryl hydrogen sulphate NaOHC11H23CH2O SO3-Na+Sod. lauryl sulphate

Difficulty Level:

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