Answer: One other carbon atom.
- A Three other carbon atoms
- B Two other carbon atoms
- C One other carbon atom
- D No other carbon atom
Correct answer: C. One other carbon atom
Explanation: A primary carbon has one other carbon attached to it (plus the halogen); hence the prefix primary.
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.