1, 2, and 3 amines can be best distinguished by:

{H N O}_{2}

treatment

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Solution

The correct option is B ${H N O}_{2}$ treatment
Reaction with $H N O_{2} (N a N O_{2} + H C l o r H_{2} S O_{4})$ :
(a) Primary amines react with nitrous acid to produce nitrogen gas (seen as bubbles)
$R - N H_{2} + H O N O \to R - O H + N_{2} ↑ + H_{2} O$
$C H_{3} N H_{2} + H N O_{2} \to C H_{2} - O - C H_{3}$
(b) $R_{2} N H + H O N O \to R_{2} N - N O + H_{2} O$
N-nitroso amine (Yellow oily layer)
This is called libbermann's nitroso test
(c) $R_{3} N + H O N O \to R_{3} \oplus N H N O_{2}$ Trialkyl ammonium nitrite (soluble in water)

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