Two isomeric ketones, 3-pentanone and 2-pentanone can be distinguished by:

I_{2} / N a O H

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N a S O_{3} H

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N a C N / H C l

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2,4-DNP

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Solution

The correct options are
A $N a S O_{3} H$
D $I_{2} / N a O H$
Two isomeric ketones, 3-pentanone $C H_{3} C H_{2} C O C H_{2} C H_{3}$ and 2-pentanone $C H_{3} C O C H_{2} C H_{2} C H_{3}$ can be distinguished by $I_{2} / N a O H$ . The name of the reaction is iodoform reaction and is given by compounds containing methyl keto group $C H_{3} C O$
We can also use $N a S O_{3} H$ to distinguish 3-pentanone and 2-pentanone.

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