Predict the products and write a mechanism, using curved-arrows, for the SN2 reaction given below. Be sure to show all lone-pair electrons and formal charges on each structure. It might also help to draw the Lewis structures. Then, clearly label the nucleophile (Nu) and the leaving group (LG). H CN + Br Draw the transition state. Provide an overall rate expression for the reaction above. Draw a potential energy versus reaction coordinate diagram for the above reaction assuming it to be exergonic. Clearly label, ON THE DIAGRAM, the axes, the reactants, the products, the activation energy (Ea), the transition state (TS), the overall free energy change (AG).

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**Transcription for Educational Website**

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**Predict the products and write a mechanism**, using curved-arrows, for the S<sub>N</sub>2 reaction given below. Be sure to show all lone-pair electrons and formal charges on each structure. It might also help to draw the Lewis structures. Then, clearly label the **nucleophile (Nu)** and the **leaving group (LG)**.

![Chemical Reaction]

- **Nucleophile (Nu):** \[\text{:C}\equiv \text{N}^{-}\]
- **Reactant:** \[\text{H}_{3}\text{CBr}\]

**Draw the transition state.**

**Provide an overall rate expression for the reaction above.**

**Draw a potential energy versus reaction coordinate diagram** for the above reaction assuming it to be exergonic. Clearly label, **ON THE DIAGRAM**, the axes, the reactants, the products, the activation energy (Ea), the transition state (TS), the overall free energy change (ΔG).

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**Graph Explanation**

1. **Axes:**
   - The x-axis represents the reaction coordinate, showing the progression from reactants to products.
   - The y-axis represents potential energy.

2. **Curve:**
   - Begin with a higher energy level where the reactants are.
   - A peak indicates the transition state (TS), which is the highest energy point, representing the activation energy (Ea).
   - The curve then descends to a lower energy level where the products are formed.

3. **Labels:**
   - Clearly mark the starting point as "Reactants" and the endpoint as "Products."
   - Indicate the energy difference between the reactants and products as the overall free energy change (ΔG), showing it as negative for exergonic reactions.

This graphical representation helps visualize the energy changes throughout the S<sub>N</sub>2 reaction process.
Transcribed Image Text:**Transcription for Educational Website** --- **Predict the products and write a mechanism**, using curved-arrows, for the S<sub>N</sub>2 reaction given below. Be sure to show all lone-pair electrons and formal charges on each structure. It might also help to draw the Lewis structures. Then, clearly label the **nucleophile (Nu)** and the **leaving group (LG)**. ![Chemical Reaction] - **Nucleophile (Nu):** \[\text{:C}\equiv \text{N}^{-}\] - **Reactant:** \[\text{H}_{3}\text{CBr}\] **Draw the transition state.** **Provide an overall rate expression for the reaction above.** **Draw a potential energy versus reaction coordinate diagram** for the above reaction assuming it to be exergonic. Clearly label, **ON THE DIAGRAM**, the axes, the reactants, the products, the activation energy (Ea), the transition state (TS), the overall free energy change (ΔG). --- **Graph Explanation** 1. **Axes:** - The x-axis represents the reaction coordinate, showing the progression from reactants to products. - The y-axis represents potential energy. 2. **Curve:** - Begin with a higher energy level where the reactants are. - A peak indicates the transition state (TS), which is the highest energy point, representing the activation energy (Ea). - The curve then descends to a lower energy level where the products are formed. 3. **Labels:** - Clearly mark the starting point as "Reactants" and the endpoint as "Products." - Indicate the energy difference between the reactants and products as the overall free energy change (ΔG), showing it as negative for exergonic reactions. This graphical representation helps visualize the energy changes throughout the S<sub>N</sub>2 reaction process.
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