Question

Which from following statements is correct regarding a detergent sodium lauryl sulphate?

• A. It is anionic detergent and is used in toothpaste.
• B. It is cationic detergent and is used as household detergent.
• C. It is cationic detergent and is used as hair conditioner.
• D. It is an ether and used as liquid detergent.

Hint:

Anionic detergents like Lauryl Sulphate are common in toothpaste. Cationic detergents (like Cetyltrimethylammonium bromide) are usually in hair conditioners.

Answer 1

The Correct Option is A

Step 1: Concept
Detergents are classified into anionic, cationic, and non-ionic based on the charge of the hydrophilic part of the molecule.

Step 2: Meaning
Sodium lauryl sulphate is a sodium salt of a sulphonated long chain alcohol.

Step 3: Analysis
In sodium lauryl sulphate ($\text{CH}_3(\text{CH}_2)_{10}\text{CH}_2\text{OSO}_3^-\text{Na}^+$), the anionic part is responsible for the cleansing action. It is widely used in toothpaste and shampoos.

Step 4: Conclusion
Statement (A) correctly identifies its classification and common usage. Final Answer: (A)