Answer: 1,4-dichlorobenzene (para) and 1,2-dichlorobenzene (ortho) as major products.
- A 1,3-dichlorobenzene (meta), formed because chlorine is a meta director here
- B Hexachlorobenzene, formed via complete substitution of all six ring positions
- C Chlorocyclohexane, formed by saturation of the aromatic ring with chlorine
- D 1,4-dichlorobenzene (para) and 1,2-dichlorobenzene (ortho) as major products
Correct answer: D. 1,4-dichlorobenzene (para) and 1,2-dichlorobenzene (ortho) as major products
Explanation: In chlorobenzene, Cl is ortho/para directing; electrophilic chlorination (Cl₂/FeCl₃) gives predominantly ortho and para products.
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.