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NEET 2020 · ChemistryPrevious Year Question

The elimination reaction of 2-bromopentane to form pent-2-ene is: (a) a -elimination reaction (b) follows Zaitsev (Saytzeff) rule (c) a dehydrohalogenation reaction (d) a dehydration reaction The correct set of statements is:

Answer: (C) (C) (a), (b), (c). Loss of from a -carbon and from the -carbon of is a -elimination (a, true).

  1. A.(A) (b), (c), (d)
  2. B.(B) (a), (b), (d)
  3. C.(C) (a), (b), (c)✓
  4. D.(D) (a), (c), (d)

Correct Answer

(C) (C) (a), (b), (c)

Solution & Explanation

Loss of from a -carbon and from the -carbon of is a -elimination (a, true). It gives the more substituted alkene pent-2-ene as the major product, following Zaitsev's rule (b, true). Since (a hydrogen halide) is removed, it is a dehydrohalogenation (c, true). It is NOT a dehydration, as no water/ is lost (d, false). Correct set = (a), (b), (c).

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