What is the main product when 1-butyne is treated with HBr?

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Q: What is the main product when 1-butyne is treated with HBr?

Solution: When 1-butyne reacts with HBr, the main product is 2-bromobutane due to Markovnikov's rule.

Steps: 7

Step 1: Identify the reactant, which is 1-butyne. 1-butyne is an alkyne with the formula C4H6.
Step 2: Identify the reagent, which is HBr (hydrobromic acid).
Step 3: Understand that when an alkyne reacts with HBr, the hydrogen (H) from HBr will add to the carbon with the most hydrogen atoms (the less substituted carbon).
Step 4: Apply Markovnikov's rule, which states that in the addition of HX to an alkene or alkyne, the hydrogen atom will attach to the carbon with the most hydrogen atoms already attached.
Step 5: In 1-butyne, the first carbon (C1) has 3 hydrogen atoms, and the second carbon (C2) has 1 hydrogen atom. Therefore, H will add to C1.
Step 6: The Br from HBr will then attach to the second carbon (C2), resulting in the formation of 2-bromobutane.
Step 7: Conclude that the main product of the reaction is 2-bromobutane.