Vhich of the following addition reactions is/are not likely to occur? Why? Br а) + Br2 Br Br b) Br2 + Br Br c) + Br2 Br

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**Question:** Which of the following addition reactions is/are not likely to occur? Why?

**Diagrams:**
1. **Diagram (a):**
   - **Reactants:** 
     - A linear alkene structure with a double bond between two carbon atoms.
     - Bromine (Br₂).
   - **Product:** 
     - A bromoalkane with each bromine atom added across the double bond.

2. **Diagram (b):**
   - **Reactants:**
     - A five-membered ring with sulfur (S) and two adjacent carbon-carbon double bonds.
     - Bromine (Br₂).
   - **Product:** 
     - A ring structure with bromine atoms added across one of the double bonds, with the sulfur retaining a pair of lone electrons.

3. **Diagram (c):**
   - **Reactants:**
     - A six-membered ring with three conjugated double bonds (benzene).
     - Bromine (Br₂).
   - **Product:** 
     - A dibrominated cyclohexene structure, with bromine added across one of the double bonds, breaking the aromaticity.

**Explanation:**
Each diagram illustrates the addition of bromine across double bonds. Reactions (a) and (b) are typical addition reactions to alkenes, whereas reaction (c) involves an aromatic compound, which is less likely to undergo simple addition due to the stabilization from its aromaticity. Instead, aromatic compounds typically undergo substitution reactions.
Transcribed Image Text:**Question:** Which of the following addition reactions is/are not likely to occur? Why? **Diagrams:** 1. **Diagram (a):** - **Reactants:** - A linear alkene structure with a double bond between two carbon atoms. - Bromine (Br₂). - **Product:** - A bromoalkane with each bromine atom added across the double bond. 2. **Diagram (b):** - **Reactants:** - A five-membered ring with sulfur (S) and two adjacent carbon-carbon double bonds. - Bromine (Br₂). - **Product:** - A ring structure with bromine atoms added across one of the double bonds, with the sulfur retaining a pair of lone electrons. 3. **Diagram (c):** - **Reactants:** - A six-membered ring with three conjugated double bonds (benzene). - Bromine (Br₂). - **Product:** - A dibrominated cyclohexene structure, with bromine added across one of the double bonds, breaking the aromaticity. **Explanation:** Each diagram illustrates the addition of bromine across double bonds. Reactions (a) and (b) are typical addition reactions to alkenes, whereas reaction (c) involves an aromatic compound, which is less likely to undergo simple addition due to the stabilization from its aromaticity. Instead, aromatic compounds typically undergo substitution reactions.
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