In the elimination reaction of ethyl alcohol to ethene ____________

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dilute sulphuric acid is used as a catalyst which acts as a dehydrating agent.

conc. sulphuric acid is used as a dehydrating agent.

dilute sulphuric acid is used as a catalyst which acts as a reducing agent.

conc. sulphuric acid is only used as a catalyst which is used to increase the rate of reaction.

answer is A.

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Detailed Solution

When ethanol reacts with concentrated sulphuric acid at 443K, ethanol gets converted to ethene by losing a water molecule. Since a water molecule is lost during the reaction, sulphuric acid acts as a dehydrating agent which removes the excess water formed during the reaction.
The reaction is:
$C H_{3} - C H_{2} O H \to_{H_{2} S O_{4}}^{H o t c o n c .} C H_{2} = C H_{2} + H_{2} O$

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