The main product obtained by heating ethanol with concentrated sulphuric acid at 383 K is :

Options

A. Ethylene
B. Ethyl hydrogen sulphate
C. Ethyoxyethene
D. Ethoxyethane

Answer

To solve the question regarding the main product obtained by heating ethanol with concentrated sulfuric acid at 383 K, we can follow these steps:

### Step 1: Identify the Reactants
The reactants in this reaction are ethanol (C2H5OH) and concentrated sulfuric acid (H2SO4).

### Step 2: Write the Reaction
When ethanol is heated with concentrated sulfuric acid, the reaction can be represented as follows:
\[ \text{C2H5OH} + \text{H2SO4} \rightarrow \text{C2H5HSO4} + \text{H2O} \]
Here, ethyl hydrosulfate (C2H5HSO4) is formed along with water.

### Step 3: Understand the Mechanism
1. **Protonation of Ethanol**: The sulfuric acid donates a proton (H+) to the ethanol, leading to the formation of an ethyl oxonium ion (C2H5OH2+).
2. **Formation of Carbocation**: The oxonium ion can lose a water molecule, resulting in the formation of a carbocation (C2H5+).
3. **Nucleophilic Attack**: The bisulfate ion (HSO4-) from sulfuric acid acts as a nucleophile and attacks the carbocation, forming ethyl hydrosulfate (C2H5HSO4).

### Step 4: Identify the Main Product
The main product obtained from this reaction at 383 K is ethyl hydrosulfate (C2H5HSO4).

### Conclusion
Thus, the main product obtained by heating ethanol with concentrated sulfuric acid at 383 K is ethyl hydrosulfate (C2H5HSO4).

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