Which of the following reaction conditions are used for the conversion of ethanol to ethylene?

conc.

H_{2} S O_{4} / 70^{0} C

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dil.

H_{2} S O_{4} / 140^{0} C

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dil.

H_{2} S O_{4} / 100^{0} C

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conc.

H_{2} S O_{4} / 170^{0} C

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Solution

The correct option is D conc. $H_{2} S O_{4} / 170^{0} C$
Ethanol is converted to ethylene by using conc. $H_{2} S O_{4}$ at $170^{o} C$ .

Conc. $H_{2} S O_{4}$ at $170^{o} C$ acts as a dehydrating reagent and due to dehydration of ethanol it is converted into ethylene and water.

$C_{2} H_{5} O H C o n c . H_{2} S O_{4} - ------- \to C_{2} H_{4}$ + $H_{2} O$

Option D is correct.

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