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In an addition reaction of HBr to an alkene, what is the major product when the

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Question: In an addition reaction of HBr to an alkene, what is the major product when the alkene is asymmetric?

Options:

  1. The product with the bromine on the more substituted carbon.
  2. The product with the bromine on the less substituted carbon.
  3. A racemic mixture of products.
  4. No reaction occurs.

Correct Answer: The product with the bromine on the more substituted carbon.

Solution: 

According to Markovnikov\'s rule, in the addition of HBr to an asymmetric alkene, the hydrogen will add to the less substituted carbon, and the bromine will add to the more substituted carbon.

In an addition reaction of HBr to an alkene, what is the major product when the

Practice Questions

Q1
In an addition reaction of HBr to an alkene, what is the major product when the alkene is asymmetric?
  1. The product with the bromine on the more substituted carbon.
  2. The product with the bromine on the less substituted carbon.
  3. A racemic mixture of products.
  4. No reaction occurs.

Questions & Step-by-Step Solutions

In an addition reaction of HBr to an alkene, what is the major product when the alkene is asymmetric?
  • Step 1: Identify the alkene. An alkene is a type of hydrocarbon that has a double bond between two carbon atoms.
  • Step 2: Determine if the alkene is asymmetric. An asymmetric alkene has different groups attached to the carbon atoms involved in the double bond.
  • Step 3: Apply Markovnikov's rule. This rule states that when HBr adds to an asymmetric alkene, the hydrogen (H) will attach to the carbon with fewer substituents (less substituted carbon).
  • Step 4: Identify the more substituted carbon. This is the carbon that has more groups or atoms attached to it.
  • Step 5: Attach the bromine (Br) to the more substituted carbon. This means that after the reaction, the hydrogen will be on one carbon and the bromine will be on the other carbon.
  • Markovnikov's Rule – In the addition of HX to an asymmetric alkene, the hydrogen atom attaches to the carbon with more hydrogen atoms (less substituted), while the halide (Br) attaches to the carbon with fewer hydrogen atoms (more substituted).
  • Asymmetric Alkenes – Alkenes that have different substituents on either side of the double bond, leading to different possible products in addition reactions.
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