Question

Which of the following amines form unstable diazonium salt?

• A. $C_6{H}_5{NH}_2$
• B. ${\left(C_2{H}_5\right)}_{2}NH$
• C. ${\left(C_2{H}_5\right)}_{3}N$
• D. ${CH}_3{NHC}_2{H}_5$

Answer 1

Answer: (B), (C), (D)

The correct options are
B ${\left(C_2{H}_5\right)}_{2}NH$
C ${CH}_3{NHC}_2{H}_5$
D ${\left(C_2{H}_5\right)}_{3}N$

Only primary aromatic amines form stable arene diazonium salts.
The reaction is as follows:

$C_6{H}_{5}N{H}_2+NaN{O}_2+HCl(0-5^{\circ }C)\to Ph{N}_2^{+}C{l}^{-}$

Remain forms the unstable diazonium salt.

So, the correct options are $B$, $C$, $D$