The best method to purify impure acetone is:

C H_{3} C O C H_{3} + H C l \to C H_{3} - O H | C | C l - C H_{3} h e a t - - \to C H_{3} C O C H_{3}

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C H_{3} C O C H_{3} + N a H S O_{3} \to C H_{3} - O H | C | C H_{3} - S O_{3} N a N a_{2} C O_{3} - ---- \to C H_{3} C O C H_{3}

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C H_{3} C O C H_{3} + H C N \to C H_{3} - O H | C | C N - C H_{3} H O H - -- \to C H_{3} C O C H_{3}

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C H_{3} C O C H_{3} + H_{2} S O_{4} \to C H_{3} - O H | C | O S O_{3} H - C H_{3} H e a t - -- \to C H_{3} C O C H_{3}

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Solution

The correct option is B $C H_{3} C O C H_{3} + N a H S O_{3} \to C H_{3} - O H | C | C H_{3} - S O_{3} N a N a_{2} C O_{3} - ---- \to C H_{3} C O C H_{3}$
To purify any compound, if we make salt of it, then it is very easy to purify teh same due to crystalline nature of the salt,
( $C H_{3} - C H C H_{3} S O_{3}^{-} N a^{+}$ ) it is easy to separate in the ionic solvent like bicarbonate, etc.

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