Draw the structures of the two carbocation intermediates that might form during the reaction of 4-methyl-2-pentene (above) with HBr.

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**Chemical Structure and Reaction Analysis:**

The image presents the structural formula of 4-methyl-2-pentene, shown as a branched chain alkene.

**Task:**
"Draw the structures of the two carbocation intermediates that might form during the reaction of 4-methyl-2-pentene with HBr."

**Explanation:**

When 4-methyl-2-pentene reacts with HBr (hydrobromic acid), it undergoes an addition reaction, which may proceed through the formation of carbocation intermediates. The most stable carbocation will determine the major product of the reaction.

1. **Primary Carbocation Intermediate:** 
   - Formed when the hydrogen from HBr adds to the terminal carbon of the double bond, resulting in a positively charged secondary carbon center.
   - Less stable due to less alkyl substitution and lack of hyperconjugation.

2. **Secondary Carbocation Intermediate:**
   - Formed when the hydrogen adds to the less substituted carbon, resulting in a more substituted and stabilized tertiary carbocation.
   - More stable because of greater alkyl substitution, providing better hyperconjugation and inductive effects.

The secondary carbocation is typically the favored pathway due to its increased stability, leading to the major product of the reaction.
Transcribed Image Text:**Chemical Structure and Reaction Analysis:** The image presents the structural formula of 4-methyl-2-pentene, shown as a branched chain alkene. **Task:** "Draw the structures of the two carbocation intermediates that might form during the reaction of 4-methyl-2-pentene with HBr." **Explanation:** When 4-methyl-2-pentene reacts with HBr (hydrobromic acid), it undergoes an addition reaction, which may proceed through the formation of carbocation intermediates. The most stable carbocation will determine the major product of the reaction. 1. **Primary Carbocation Intermediate:** - Formed when the hydrogen from HBr adds to the terminal carbon of the double bond, resulting in a positively charged secondary carbon center. - Less stable due to less alkyl substitution and lack of hyperconjugation. 2. **Secondary Carbocation Intermediate:** - Formed when the hydrogen adds to the less substituted carbon, resulting in a more substituted and stabilized tertiary carbocation. - More stable because of greater alkyl substitution, providing better hyperconjugation and inductive effects. The secondary carbocation is typically the favored pathway due to its increased stability, leading to the major product of the reaction.
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