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Reaction of Alcohols with Phosohorus Halides

A compound X ...

Question

A compound X of the formula $C_{2} H_{6} O$ , on reaction with Na metal gave Y, X also reacts with $P C l_{5}$ to give Z. The product obtained in the reaction between Y and Z is :

A

C H_{3} C H O

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B

C H_{3} C O C H_{3}

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C

C H_{3} C O O C_{2} H_{5}

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D

C_{2} H_{5} O C_{2} H_{5}

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Solution

The correct option is D $C_{2} H_{5} O C_{2} H_{5}$
The compound X, Y and Z are ethanol $(C_{2} H_{5} O H)$ , sodium ethoxide $C_{2} H_{5} O N a$ and ethyl chloride $C_{2} H_{5} C l$ respectively.
Ethanol reacts with Na metal to form sodium ethoxide.

$C_{2} H_{5} O H N a - - \to C_{2} H_{5} O N a + 0.5 H_{2}$
Ethanol also reacts with $P C l_{5}$ to give ethyl chloride.

$C_{2} H_{5} O H P C l_{5} - -- \to C_{2} H_{5} C l$
The product obtained in the reaction between sodium ethoxide and ethyl chloride is diethyl ether.

$C_{2} H_{5} O N a + C_{2} H_{5} C l - N a C l - --- \to C_{2} H_{5} O C_{2} H_{5}$

Hence, the correct option is 'D'

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Q. A neutral compound 'X' of molecular formula C₂H₆O on oxidation with acidified potassium dichromate gives a compound 'Y'. Compound 'X' reacts with 'Y' on warming in presence of conc. H₂SO₄to give a sweet smelling substance 'Z'. What are 'X', 'Y' and 'Z'? Give equations of the reactions involved.

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