Answer: Phenol.
- A Benzene
- B Phenol
- C Aniline
- D Benzaldehyde
Correct answer: B. Phenol
Explanation: Chlorobenzene undergoes nucleophilic substitution only under drastic conditions (300°C, 200 atm NaOH) to give phenol; this is the Dow process.
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.