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Synthesis of Ethers

Which one of ...

Question

Which one of the following reaction conditions are used for preparing diethyl ether from ethyl alcohol?

H I / 200^{\circ} C

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C o n c . H_{2} S O_{4} / 140^{\circ} C

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N a O H / 70^{\circ} C

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N a O C_{2} H_{5} / 27^{\circ} C

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Solution

The correct option is D $C o n c . H_{2} S O_{4} / 140^{\circ} C$
preparation of diethyl ether from ethyl alcohol requires the acidic atmosphere which is created by $c o n c . H_{2} S O_{4} 140^{o} C$ , the reaction is: here 'R' is $- C_{2} H_{5}$

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Diethyl ether $C_{4} H_{10} O$ , used medically as an anesthetic, is prepared from ethyl alcohol $C_{2} H_{5} O H$ in presence of an acid.

$2 C_{2} H_{5} O H a c i d - - \to 140^{0} C_{2} H_{5} O C_{2} H_{5} + H_{2} O$

Calculate the $%$ yield if $46 g$ of ethyl alcohol gives $30 g$ of ether.

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