2. a. Neatly provide a mechanism for the reaction shown below. Arrows need to be precise. HBr Br

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### Transcription for Educational Website 

---

### Organic Chemistry: Reaction Mechanism 

**2. (a) Neatly provide a mechanism for the reaction shown below. Arrows need to be precise.**

#### Reaction:

The structure on the left is an alkyne with three carbon atoms attached to each carbon in the triple bond. The reactant is treated with HBr, and the product is an alkene with a bromine atom attached to carbon 2.

**Reactant:**
```
       H
       |
    HC≡C-CH2-CH2-CH3
```

**Reagent:**
```
    HBr
```

**Product:**
```
    Br
    |
   HC=CH-CH2-CH2-CH3
```

The reaction shows the addition of HBr to an alkyne to form an alkene with a bromine atom. This type of reaction involves the addition of hydrogen halides to carbon atoms in a structured sequence typically dictated by Markovnikov's rule, where the hydrogen (H) from HBr adds to the carbon with the most hydrogen atoms already attached, and the bromine (Br) adds to the other carbon.

---

*Note: Ensure precise arrow placement to reflect movement of electron pairs in your proposed mechanism.*
Transcribed Image Text:### Transcription for Educational Website --- ### Organic Chemistry: Reaction Mechanism **2. (a) Neatly provide a mechanism for the reaction shown below. Arrows need to be precise.** #### Reaction: The structure on the left is an alkyne with three carbon atoms attached to each carbon in the triple bond. The reactant is treated with HBr, and the product is an alkene with a bromine atom attached to carbon 2. **Reactant:** ``` H | HC≡C-CH2-CH2-CH3 ``` **Reagent:** ``` HBr ``` **Product:** ``` Br | HC=CH-CH2-CH2-CH3 ``` The reaction shows the addition of HBr to an alkyne to form an alkene with a bromine atom. This type of reaction involves the addition of hydrogen halides to carbon atoms in a structured sequence typically dictated by Markovnikov's rule, where the hydrogen (H) from HBr adds to the carbon with the most hydrogen atoms already attached, and the bromine (Br) adds to the other carbon. --- *Note: Ensure precise arrow placement to reflect movement of electron pairs in your proposed mechanism.*
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