Answer: DDT (a persistent insecticide).
- A DDT (a persistent insecticide)
- B BHC (benzene hexachloride)
- C Freon-12 (a refrigerant)
- D chloroform (an anaesthetic)
Correct answer: A. DDT (a persistent insecticide)
Explanation: This condensation of two chlorobenzene molecules with chloral produces DDT, once a widely used insecticide.
SN2 proceeds in a single step with backside attack and inversion of configuration, while SN1 forms a planar carbocation intermediate first, leading to racemisation.
Concept context
Study carbon-halogen compounds: how they are made, how they react via SN1/SN2 and elimination, their stereochemistry, and their environmental impact.