Structure and electrophilic addition reactions of alkenes Quiz
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5 questions, one answer each
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1. Which feature of an alkene makes it react with electrophiles?
- A. A δ+ carbon atom
- B. A centre of high electron density in C=C
- C. A polar C–H bond
- D. Free radicals
2. What is observed when ethene is shaken with bromine water?
- A. It stays orange
- B. It turns green
- C. A precipitate forms
- D. It turns colourless
3. Which carbocation is formed from propene on the route to the major product with HBr?
- A. CH₃CH₂CH₂⁺
- B. CH₃⁺
- C. CH₃CH⁺CH₃
- D. CH₂⁺CH=CH₂
4. What is the product of the reaction of but-2-ene with bromine?
- A. 2-bromobutane
- B. 1,2-dibromobutane
- C. 2,2-dibromobutane
- D. 2,3-dibromobutane
5. Why does the major product from propene and HBr arise from the secondary carbocation?
- A. It has two electron-releasing alkyl groups, which stabilise it more than the primary carbocation
- B. It has more hydrogen atoms
- C. It is formed from a stronger C–H bond
- D. It is formed by a free-radical route