What is the major product of the reaction between 1-butyne and HBr?
Practice Questions
Q1
What is the major product of the reaction between 1-butyne and HBr?
1-bromobutane
2-bromobutane
butane
bromobenzene
Questions & Step-by-Step Solutions
What is the major product of the reaction between 1-butyne and HBr?
Step 1: Identify the reactant, which is 1-butyne. It is an alkyne with a triple bond between the first and second carbon atoms.
Step 2: Identify the reagent, which is HBr. It is a strong acid that can add across the triple bond of the alkyne.
Step 3: Apply Markovnikov's rule. This rule states that when HX (like HBr) adds to an alkene or alkyne, the hydrogen (H) will attach to the carbon with more hydrogen atoms already (the less substituted carbon).
Step 4: In 1-butyne, the first carbon has one hydrogen, and the second carbon has two hydrogens. Therefore, the H from HBr will attach to the first carbon.
Step 5: The Br from HBr will attach to the second carbon, resulting in the formation of 2-bromobutane.
Step 6: Conclude that the major product of the reaction is 2-bromobutane.
