Identify the product(s) of the reaction below. hv ? NBS Br Br Br Br

Chemistry
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Chapter1: Chemical Foundations
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**Reaction Identification Exercise**

**Objective:**
Identify the product(s) of the reaction described below.

**Reaction Overview:**
- Starting material: A molecule with the structure of a 4-carbon chain having a methyl group attached to the second carbon, and a double bond between the first and second carbons.
- Reaction conditions: 
  - Presence of NBS (N-Bromosuccinimide)
  - Light exposure (indicated by \( h\nu \))

**Potential Products:**

1. **Product I:**
   - Structure: Contains a bromine (Br) atom attached to the carbon that was originally part of the double bond, resulting in a vinyl bromide at the first carbon.

2. **Product II:**
   - Structure: Similar to Product I, but with the Br attached to the methyl group, creating an allylic bromination with Br at the mid-carbon position.

3. **Product III:**
   - Structure: Contains a Br at the fourth carbon of the original molecule, while maintaining the double bond between the first and second carbons.

4. **Product IV:**
   - Structure: The Br is attached to the third carbon, resulting in a different potential for allylic bromination, maintaining the original double bond configuration.

**Answer Options:**
- a. I
- b. III
- c. I and II
- d. I and IV

**Explanation of Diagram:**
- The diagram illustrates a primary organic reaction setup, highlighting possible brominated products.
- Each product demonstrates a unique positional isomer resulting from allylic bromination using NBS under light conditions.
- The inclusion of the different configurations shows possible outcomes based on reaction conditions, providing multiple-choice answers for educational interpretation.

This exercise challenges the understanding of selectivity in allylic bromination, a common reaction in organic chemistry.
Transcribed Image Text:**Reaction Identification Exercise** **Objective:** Identify the product(s) of the reaction described below. **Reaction Overview:** - Starting material: A molecule with the structure of a 4-carbon chain having a methyl group attached to the second carbon, and a double bond between the first and second carbons. - Reaction conditions: - Presence of NBS (N-Bromosuccinimide) - Light exposure (indicated by \( h\nu \)) **Potential Products:** 1. **Product I:** - Structure: Contains a bromine (Br) atom attached to the carbon that was originally part of the double bond, resulting in a vinyl bromide at the first carbon. 2. **Product II:** - Structure: Similar to Product I, but with the Br attached to the methyl group, creating an allylic bromination with Br at the mid-carbon position. 3. **Product III:** - Structure: Contains a Br at the fourth carbon of the original molecule, while maintaining the double bond between the first and second carbons. 4. **Product IV:** - Structure: The Br is attached to the third carbon, resulting in a different potential for allylic bromination, maintaining the original double bond configuration. **Answer Options:** - a. I - b. III - c. I and II - d. I and IV **Explanation of Diagram:** - The diagram illustrates a primary organic reaction setup, highlighting possible brominated products. - Each product demonstrates a unique positional isomer resulting from allylic bromination using NBS under light conditions. - The inclusion of the different configurations shows possible outcomes based on reaction conditions, providing multiple-choice answers for educational interpretation. This exercise challenges the understanding of selectivity in allylic bromination, a common reaction in organic chemistry.
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