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Ethanol and ethanal are separated from their mixture using the reagent

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$N a H S O_{3}$

$H C N$

$N a O H$ $+ I_{2}$

answer is B.

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Detailed Solution

Aldehyde and ketones add to $N a H S O_{3}$ to give white precipitate but such action is not shown by alcohol.

In this case, ethanal reacts with $N a H S O_{3}$ to give a white precipitate.

$C H_{3} C H O + N a H S O_{3} \to C H_{3} C H (S O_{3} N a) O H$

Ethanal Sodiumbisulphide White Solid Ppt (Water soluble)

Hence, the correct option is option (B) $N a H S O_{3}$

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