Question

C2H4→C2H5OH→C2H4→С2Н5Br

Answer 1

C2H4+HOH-->C2H5OH

C2H5OH-->C2H4+HOH

C2H4+HBr-->C2H5Br

Answer 2

The given chemical reaction sequence involves the conversion of ethene (C2H4) into ethanol (C2H5OH), then back to ethene, and finally to ethyl bromide (C2H5Br). Let's break down each step:

Step 1: C2H4 → C2H5OH In this step, ethene (C2H4) undergoes a chemical reaction to form ethanol (C2H5OH). This reaction is an example of an addition reaction where an alcohol is formed. The reaction typically requires a catalyst, such as concentrated sulfuric acid or phosphoric acid.

Step 2: C2H5OH → C2H4 This step involves the conversion of ethanol (C2H5OH) back to ethene (C2H4). This reaction is known as dehydration, where water is removed from the alcohol molecule. It can be accomplished by heating ethanol in the presence of a catalyst, such as alumina (Al2O3), at high temperatures.

Step 3: C2H4 → C2H5Br In the final step, ethene (C2H4) reacts with hydrogen bromide (HBr) to form ethyl bromide (C2H5Br). This reaction is an example of an electrophilic addition reaction, where the hydrogen bromide adds across the double bond of ethene to form the alkyl bromide.

Overall, the chemical reaction sequence you provided describes a series of transformations involving the conversion of ethene to ethanol, then back to ethene, and finally to ethyl bromide.