Draw the major product expected when 1,3-butadiene is treated with one equivalent of hbr at 0âºc, and show a mechanism of its formation.

Zero order

Explanation:

Reaction rate for experiment 1 =

1.496 - 1.512 / 30 - 0 = - 5.3 * 10^-4 Ms-1

Reaction rate for experiment 2

2.552 - 2.584/60 - 0 =  - 5.3 * 10^-4 Ms-1

So,

Since the rate of reaction does not change with change in concentration of reactants (identified by the fact that the rates of reaction 1 and reaction 2 are the same), the reaction is zero order.