Primary and secondary amines are distinguished by:

B r_{2} / K O H

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H C l O

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H N O_{2}

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N H_{3}

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Solution

The correct option is D $H N O_{2}$
Primary and secondary amines are distinguished by nitrous acid $H N O_{2}$

Primary amines when reacted with nitrous acid forms alcohols and secondary amines when reacted with nitrous acid forms N-nitroso derivative.

$1^{0}$ Amines: $R - N H_{2} \to^{H N O_{2}} R - N^{+} \equiv N X^{-} \to R^{+} \to R - O H (a l c o h o l)$

$2^{0}$ Amines: $R_{2} - N H \to^{H N O_{2}} R_{2} - N - N O (N - n i t r o s o d e r i v a t i v e)$

Option C is correct.

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