Question

Which isomeric form of benzene hexachloride is used as insecticide?

• A. $\alpha$-form
• B. $\beta$-form
• C. $\gamma$-form
• D. $\delta$-form

Hint:

Remember: $\gamma$-BHC = Lindane = insecticide (very common exam question).

Answer 1

The Correct Option is C

Concept: Benzene Hexachloride (BHC) BHC (hexachlorocyclohexane) exists in several isomeric forms: \[ \alpha,\; \beta,\; \gamma,\; \delta \]

Step 1: Identify insecticidal isomer \[ \gamma\text{-isomer of BHC} \equiv \text{Lindane} \]
• Highly effective insecticide
• Acts on nervous system of insects

Step 2: Other isomers
• $\alpha$, $\beta$, $\delta$ forms are less active or inactive
• $\beta$-form is most stable but not insecticidal Final Answer: \[ {\gamma\text{-form (Lindane)}} \]