Choose the correct product for the halogenation reaction below. Br Br Br2 ? II heat Br Br II IV а. b. II C. IV O d. II

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Chapter1: Chemical Foundations
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**Halogenation Reaction: Determining the Correct Product**

In the provided chemical reaction, cyclohexane with a propyl substituent is treated with bromine (\( \text{Br}_2 \)) under heat. This setup suggests a free radical halogenation reaction. The aim is to identify the correct reaction product from the given options.

### Structures:

- **Reactant:**
  - A cyclohexane ring attached to a propyl group.

- **Products:**

  - **I**: Cyclohexane with a bromine atom on the second carbon of the propyl group (secondary carbon).
  - **II**: Cyclohexane with a bromine atom on the cyclohexane ring.
  - **III**: Cyclohexane with a bromine atom on the first carbon of the propyl group (primary carbon).
  - **IV**: Cyclohexane with a bromine atom on the third carbon of the propyl group (primary carbon).

### Options:
- a. I
- b. II
- c. IV
- d. III

**Note:** 
Free radical halogenation preferentially occurs at the more substituted carbon due to the stability of the intermediate radicals. Typically, reactions favor tertiary carbons, then secondary, and finally primary. Based on the provided structures, the correct product choice can be deduced appropriately.
Transcribed Image Text:**Halogenation Reaction: Determining the Correct Product** In the provided chemical reaction, cyclohexane with a propyl substituent is treated with bromine (\( \text{Br}_2 \)) under heat. This setup suggests a free radical halogenation reaction. The aim is to identify the correct reaction product from the given options. ### Structures: - **Reactant:** - A cyclohexane ring attached to a propyl group. - **Products:** - **I**: Cyclohexane with a bromine atom on the second carbon of the propyl group (secondary carbon). - **II**: Cyclohexane with a bromine atom on the cyclohexane ring. - **III**: Cyclohexane with a bromine atom on the first carbon of the propyl group (primary carbon). - **IV**: Cyclohexane with a bromine atom on the third carbon of the propyl group (primary carbon). ### Options: - a. I - b. II - c. IV - d. III **Note:** Free radical halogenation preferentially occurs at the more substituted carbon due to the stability of the intermediate radicals. Typically, reactions favor tertiary carbons, then secondary, and finally primary. Based on the provided structures, the correct product choice can be deduced appropriately.
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