The reaction of ethanol with conc. $H_{2} S O_{4}$ gives :

ethane

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ethene

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ethyne

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ethanoic acid

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Solution

The correct option is B ethene
Ethanol can be dehydrated to give ethene by heating it with an excess of concentrated sulphuric acid at 170 $^{0} C$ . The acid catalysts normally used in alcohol dehydration is concentrated sulphuric acid which results in alkene.
$C_{2} H_{5} O H + c o n c . H_{2} {S O}_{4} \to C_{2} H_{4} + H_{2} O$

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