Question

Помогите,пожалуйста.Выполните цепочку превращений: Карбид кальция -> ацетилен -> бромэтан -> этилен -> уксусный альдегид.Заранее спасибо!

Answer 1

1)CaC2 + 2H2O = Ca(OH)2 + C2C2
2)C2C2 + H2 = C2H4 + HBr = C2H5Br 
3)Бром выводим через реакцию Вюрца: 
2C2H5Br + 2Na ---> 2NaBr + C4H10 
Бутан раскладываем крекингом: 
C4H10 ---> C2H6 + C2H4
4)C2H4 + O2 = 2CH3-CHO

Answer 2

Transformation Chain:

To transform calcium carbide into acetylene, then into bromoethane, followed by ethylene, and finally into acetic aldehyde, the following steps can be taken:

1. Calcium Carbide to Acetylene: - Calcium carbide can be converted to acetylene through a process called calcium carbide hydrolysis. - When calcium carbide reacts with water, it produces acetylene gas and calcium hydroxide. - The chemical equation for this reaction is: ``` CaC2 + 2H2O → C2H2 + Ca(OH)2 ```

2. Acetylene to Bromoethane: - Acetylene can be converted to bromoethane through a halogenation reaction. - In the presence of a halogen such as bromine (Br2) and a solvent like carbon tetrachloride (CCl4), acetylene undergoes a halogenation reaction to form bromoethane. - The chemical equation for this reaction is: ``` C2H2 + Br2 → C2H2Br2 ```

3. Bromoethane to Ethylene: - Bromoethane can be converted to ethylene through a process called elimination reaction. - When bromoethane is treated with a strong base like sodium hydroxide (NaOH), it undergoes an elimination reaction to form ethylene. - The chemical equation for this reaction is: ``` C2H5Br + NaOH → C2H4 + NaBr + H2O ```

4. Ethylene to Acetic Aldehyde: - Ethylene can be converted to acetic aldehyde through a process called oxidative cleavage. - Ethylene undergoes oxidative cleavage to form acetaldehyde, which is also known as acetic aldehyde. - The chemical equation for this reaction is: ``` C2H4 + O2 → CH3CHO ```

By following these steps, you can transform calcium carbide into acetylene, then into bromoethane, followed by ethylene, and finally into acetic aldehyde.