By treating methyl alcohol with conc. $H_{2} S O_{4}$ at $140^{o} C$ . Which of the following products if formed?

Ethene

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Dimethyl ether

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Methyl ethylether

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Ethyne

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Solution

The correct option is B Dimethyl ether
Two molecules of methanol, undergo dehydration in the presence of conc. $H_{2} S O_{4}$ at $140^{\circ} C$ to form Dimethyl ether as:
$2 C H_{3} O H c o n c . H_{2} S O_{4} - ------ \to 140^{\circ} C C H_{3} - O - C H_{3} + H_{2} O$

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