Answer: A carboxylic acid.
- A An alcohol
- B A ketone
- C An ester
- D A carboxylic acid
Correct answer: D. A carboxylic acid
Explanation: RMgBr + CO₂ → RCO₂MgBr; hydrolysis (H₃O⁺) gives RCOOH, a carboxylic acid. This is a useful chain-extension reaction.
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.