Acetamide and ethylamine can be distinguished by using :

aqueous

H C l

and heat

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aqueous

N a O H

and heat

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B r_{2}

water

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acidic

K_{2} C r_{2} O_{7}

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Solution

The correct option is C aqueous $N a O H$ and heat
Acetamide and ethylamine can be distinguished heating with $N a O H$ solution when acetamide librates $N H_{3}$ but ethylamine does not.

$\begin{matrix} C H_{3} C O N H_{2} + N a O H △ \to C H_{3} C O O N a + N H_{3} C H_{3} C H_{2} N H_{2} + N a O H △ \to N o r e a c t i o n \end{matrix}$

Option $B$ is the correct answer.

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