In which of the following reactions 1,3-butadiene will be obtained as a major product ?

Options

A. `Br-CH_2 -CH_2-CH_2-CH_2 -Br underset((CH_3)_2 COH)overset((CH_3)_3 COK ("2 mole"))to `
B. `HO-CH_2 -CH_2 -CH_2 - CH_2 - OH overset(concH_2 SO_4)to `
C. `H_2 C= CH -= CH underset(Ni_2 B)overset(H_2"1 mole")to`
D. All of these

Answer

B

Explanation

In (a) `E_2` reaction take place.
In (b) dehydration take place. In
(c) alkyne is more reactive than alkene toward catalytic reductions.