Elimination of bromine from 2-bromobutane results in the formation of
(i)equimolar mixture of 1 and 2-butane
(ii)predominantly2-butene
(iii)predominantly 1-butene
(iv)predominantly 2-butyne.

Options

A. equimolar mixture of 1 and 2 butene
B. predominantly 2-butene
C. predominantly 1-butene
D. predominantly 2-butyne

Answer

B

Explanation

`CH_3underset("2-Bromobutane")(CH_2overset(Br)overset(|)(CH)CH_3)overset(KOH(alc.))tounderset("2-Butene(80%)")(CH_3CH=CHCH_3)underset("1-Butene(20%)")(CH_3CH_2CH=CH_2)`
In elimination reaction of alkyl halide major product is obtained according to Sayzeff's rule, which states that when two alkenes may be formed, the alkene which is most substituted one predominates.