Answer: 2-methylbut-2-ene.
- A 2-methylbut-2-ene
- B 2-methylbut-1-ene
- C 3-methylbut-1-ene
- D 2-methylbutan-1-ol
Correct answer: A. 2-methylbut-2-ene
Explanation: By Saytzeff's rule the more substituted (more stable) alkene, 2-methylbut-2-ene, predominates.
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.