For the following reaction, pick out the major product: - - Br₂ hv

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**Title: Identifying the Major Product in a Bromination Reaction**

**Question:**
For the following reaction, pick out the major product:

\[ \text{Reactant: } \quad \begin{array}{c} \text{Alkene} \\ \text{ } \end{array} \overset{Br_2}{\longrightarrow} \begin{array}{c} \text{ } \\ \text{h}\nu \end{array} \]

**Choices:**

1. **First Option:** 
   - Product: A substituted alkene with a bromine atom attached to the secondary carbon in the chain.

2. **Second Option:** 
   - Product: A substituted alkene with a bromine atom attached to the primary carbon in the chain.

3. **Third Option:** 
   - Product: A substituted alkene with a bromine atom attached to an internal secondary carbon, creating a more stable structure.

4. **Fourth Option:** 
   - Product: A substituted alkene with a bromine atom attached to another position, different from the first three options.

5. **Fifth Option:**
   - Choice: None of these

**Explanation:**

This problem presents a bromination reaction using \(\text{Br}_2\) in the presence of light (hv), which typically leads to a free radical mechanism. The task is to determine which product represents the major one formed under these conditions. The stability of the resulting radical often dictates the preference for which carbon the bromine atom will attach to, favoring more substituted (hence more stable) radicals.

**Reminder for Students:**
Consider the stability of intermediates when predicting the major product of a free radical halogenation reaction.
Transcribed Image Text:**Title: Identifying the Major Product in a Bromination Reaction** **Question:** For the following reaction, pick out the major product: \[ \text{Reactant: } \quad \begin{array}{c} \text{Alkene} \\ \text{ } \end{array} \overset{Br_2}{\longrightarrow} \begin{array}{c} \text{ } \\ \text{h}\nu \end{array} \] **Choices:** 1. **First Option:** - Product: A substituted alkene with a bromine atom attached to the secondary carbon in the chain. 2. **Second Option:** - Product: A substituted alkene with a bromine atom attached to the primary carbon in the chain. 3. **Third Option:** - Product: A substituted alkene with a bromine atom attached to an internal secondary carbon, creating a more stable structure. 4. **Fourth Option:** - Product: A substituted alkene with a bromine atom attached to another position, different from the first three options. 5. **Fifth Option:** - Choice: None of these **Explanation:** This problem presents a bromination reaction using \(\text{Br}_2\) in the presence of light (hv), which typically leads to a free radical mechanism. The task is to determine which product represents the major one formed under these conditions. The stability of the resulting radical often dictates the preference for which carbon the bromine atom will attach to, favoring more substituted (hence more stable) radicals. **Reminder for Students:** Consider the stability of intermediates when predicting the major product of a free radical halogenation reaction.
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