Haloalkanes and Haloarenes - Result Question 1
####1. Elimination reaction of 2-Bromo-pentane to form pent-2-ene is:
[2020]
(A) $\beta$-Elimination reaction
(B) Follows Zaitsev rule
(C) Dehydrohalogenation reaction
(D) Dehydration reaction
(a) (A), (C), (D)
(b) (B), (C), (D)
(c) (A), (B), (D)
(d) (A), (B), (C)
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Solution:
- (d)
CC#CCC(C)Br
2-Bromo-pentane
$ CH_3-CH=CH-CH_2-CH_3 $
Mechanism :
It is an $\beta$ elimination reaction as $\beta$ hydrogen is abstracted and results more substituted alkene, which follows Zaitsev’s rule.
Since ’ $H$ ’ and ’ $Br$ ’ are removed, it is dehydrohalogenation.
