Question

Помогити пожалуйста))этанол => атен => этанол => бромэтан => этен => этанол

Answer 1

1)C2H5OH--(t-H+)-->CH2=CH2

2)С2Н4 + H2O----> C2H5OH

3)C2H5OH + HBr--->  C2H5Br + H2O

4)C2H5Br2+KOH--(спиртовой раствор)-->C2H4+KBr+H2O

5)C2H4 + H2O --> C2H5OH

Answer 2

Chemical Reaction Sequence

The chemical reaction sequence you've provided involves the conversion of ethanol to ethene and then back to ethanol through several intermediate steps. Let's break down the steps involved in this process.

1. Ethanol to Ethene: - Ethanol can be dehydrated to form ethene through a process called dehydration. This involves the removal of a water molecule from ethanol to form ethene. - The general chemical equation for this reaction is: ``` CH3CH2OH (ethanol) → CH2=CH2 (ethene) + H2O (water) ``` - This reaction is typically carried out using a catalyst such as concentrated sulfuric acid or alumina at elevated temperatures.

2. Ethene to Bromoethane: - Ethene can undergo addition reaction with bromine to form 1,2-dibromoethane (bromoethane). - The general chemical equation for this reaction is: ``` CH2=CH2 (ethene) + Br2 (bromine) → CH2Br-CH2Br (bromoethane) ```

3. Bromoethane to Ethanol: - Bromoethane can be hydrolyzed to form ethanol through a substitution reaction with hydroxide ions (OH-) in the presence of water. - The general chemical equation for this reaction is: ``` CH2Br-CH2Br (bromoethane) + OH- (hydroxide ion) + H2O (water) → CH3CH2OH (ethanol) + Br- (bromide ion) ```

Conclusion

So, the overall chemical reaction sequence you've provided involves the dehydration of ethanol to form ethene, the addition of bromine to ethene to form bromoethane, and the hydrolysis of bromoethane to regenerate ethanol. Each step involves specific chemical reactions and conditions to facilitate the conversion from one compound to another. If you have any further questions or need more details on any specific step, feel free to ask!