Answer: Alkene.
- A Alcohol
- B Alkane
- C Carboxylic acid
- D Alkene
Correct answer: D. Alkene
Explanation: Treatment with strong base (KOH in alcohol) causes elimination of HX from a haloalkane to give an alkene.
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.