Draw the products of the following reactions.
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Answer

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Step 1
: Identify the reactants and their structures.

The reactants are but- 1 -yne (C^4H6) and hydrogen bromide (HBr). But- 1 -yne is a linear hydrocarbon with a triple bond between the first and second carbon atoms, while hydrogen bromide is a diatomic molecule consisting of hydrogen and bromine.

Step 2
: Understand the reaction mechanism.

The reaction is an electrophilic addition reaction, where the electrophile (HBr) attacks the triple bond in but- 1 -yne, leading to the formation of a new carbon-bromine bond and a carbon-hydrogen bond.

Final Answer

The major product of the reaction between but- 1 -yne and hydrogen bromide is 2 -bromobut- 1 -ene, as shown above.