NEET 2020 · ChemistryPrevious Year Question
For the elimination reaction of 2-bromopentane to form pent-2-ene, consider the following statements: (a) It is a -elimination reaction. (b) It follows Zaitsev's rule. (c) It is a dehydrohalogenation reaction. Which of the statements are correct?
Answer: (C) (a), (b), (c). \textbf{Answer:} (c) (a), (b), (c) \textbf{Solution:} Removal of H and Br from adjacent carbons is a -elimination, so statement (a) is true.
- A.(b), (c), (d)
- B.(a), (b), (d)
- C.(a), (b), (c)✓
- D.(a), (c), (d)
Correct Answer
(C) (a), (b), (c)
Solution & Explanation
\textbf{Answer:} (c) (a), (b), (c) \textbf{Solution:} Removal of H and Br from adjacent carbons is a -elimination, so statement (a) is true. The more substituted alkene pent-2-ene is formed preferentially, in accordance with Zaitsev's rule, so statement (b) is true. Loss of H and a halogen (Br) is dehydrohalogenation (not dehydration), so the intended statement (c) is true. The correct combination is (a), (b), (c), which is option C.
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