Answer: C6H5Cl.
- A CH3Cl
- B C2H5Br
- C CH2Cl<sub>2</sub>
- D C6H5Cl
Correct answer: D. C6H5Cl
Explanation: C₆H₅Cl (chlorobenzene) has the halogen directly attached to the benzene ring; it is an aryl halide.
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.