Question

Which of the following is an anionic detergent?

• A. Sodium stearate
• B. Sodium lauryl sulphate
• C. Cetyltrimethyl ammonium bromide
• D. Glyceryl oleate

Answer 1

The Correct Option is B

To determine which of the given substances is an anionic detergent, we need to understand what an anionic detergent is.

Definition: Anionic detergents are surfactants that contain a negatively charged (anionic) hydrophilic group. They are commonly used in laundry and dishwashing detergents.

Now let's evaluate the options:

1. Sodium stearate: It is a sodium salt of stearic acid and is an anionic compound. However, it is primarily used as a soap rather than a detergent.
2. Sodium lauryl sulphate (SLS): This is an anionic detergent (surfactant) widely used in many cleaning and hygiene products. SLS has a negatively charged sulfate group, which classifies it as an anionic detergent.
3. Cetyltrimethyl ammonium bromide: This is a cationic detergent as it has a positively charged nitrogen atom.
4. Glyceryl oleate: This compound is not a detergent; it's an ester used in cosmetics and is non-ionic.

Conclusion: Among the given options, Sodium lauryl sulphate is the correct answer as it is an anionic detergent characterized by its negatively charged sulfate group.