There are two products of the addition of HBr to butadiene.
What is an addition reaction?
An addition reaction is a reaction in which a compound is added across the double bond. We must recall that the compound 1,3-butadiene is a conjugated double bond hence the final products are controlled by resonance effects.
The mechanism of the addition of HBr to 1,3-butadiene is shown in the image attached to this answer.
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