Only $1^{\circ}$ aromatic amine (primary) aromatic amine) form diazonium salts at low temperature $\left(0^{\circ}-\right.$ $5^{\circ} \mathrm{C}$ ). A reaction is which $-\mathrm{NH}_{2}$ group is converted into diazo group $(-\mathrm{N}+\equiv=\mathrm{N})$ is called diazotization.s Diazotisation reactions are shown by primary aromatic amine only as the arene diazonium salt formed is stable at 273-278 K. Compound $\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CH}_{2} \mathrm{NH}_{2}$ is not an aromatic amine, hence will not give the test/reaction.
VITEEE- 2008
AMINES
278863
Fluorobenzene $\left(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{~F}\right)$ can be synthesized in the laboratory
1 by heating phenol with $\mathrm{HF}_{4}$ and $\mathrm{KF}$
2 from aniline by diazotisation followed by heating the diazonium salt with $\mathrm{HBF}_{4}$
3 by direct fluorination of benzene with $\mathrm{F}_{2}$ gas
4 by reacting bromobenzene with $\mathrm{NaF}$ solution
Only $1^{\circ}$ aromatic amine (primary) aromatic amine) form diazonium salts at low temperature $\left(0^{\circ}-\right.$ $5^{\circ} \mathrm{C}$ ). A reaction is which $-\mathrm{NH}_{2}$ group is converted into diazo group $(-\mathrm{N}+\equiv=\mathrm{N})$ is called diazotization.s Diazotisation reactions are shown by primary aromatic amine only as the arene diazonium salt formed is stable at 273-278 K. Compound $\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CH}_{2} \mathrm{NH}_{2}$ is not an aromatic amine, hence will not give the test/reaction.
VITEEE- 2008
AMINES
278863
Fluorobenzene $\left(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{~F}\right)$ can be synthesized in the laboratory
1 by heating phenol with $\mathrm{HF}_{4}$ and $\mathrm{KF}$
2 from aniline by diazotisation followed by heating the diazonium salt with $\mathrm{HBF}_{4}$
3 by direct fluorination of benzene with $\mathrm{F}_{2}$ gas
4 by reacting bromobenzene with $\mathrm{NaF}$ solution
