Answer: an alkylarene.
- A a biaryl
- B an alkylarene
- C a symmetrical ether
- D an alkane
Correct answer: B. an alkylarene
Explanation: Wurtz-Fittig couples an aryl halide with an alkyl halide to give an alkyl-substituted arene; coupling of two aryl halides (Fittig) gives a biaryl.
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.