A) \[{{C}_{6}}{{H}_{5}}N{{H}_{2}}\]
B) \[{{C}_{6}}{{H}_{5}}C{{H}_{2}}N{{H}_{2}}\]
C)
D)
Correct Answer: B
Solution :
Only \[{{1}^{o}}\] aromatic amine (primary aromatic amine) form diazonium salts at low temperature \[({{0}^{o}}-{{5}^{o}}C)\]. A reaction in which \[-N{{H}_{2}}\] group is converted into diazo group \[(-\overset{+}{\mathop{N}}\,\equiv N)\]is called diazotisation. Diazotised salts are stable in cold aqueous solution. \[{{C}_{6}}{{H}_{5}}N{{H}_{2}}+HCl\xrightarrow{{{0}^{o}}-{{5}^{o}}C}{{C}_{6}}{{H}_{5}}\overset{+}{\mathop{N{{H}_{3}}}}\,C{{l}^{-}}\] \[NaN{{O}_{2}}+HCl\xrightarrow{{{0}^{o}}-{{5}^{o}}C}HN{{O}_{2}}+NaCl\] \[{{C}_{6}}{{H}_{5}}\overset{+}{\mathop{N{{H}_{3}}}}\,C{{l}^{-}}+HN{{O}_{2}}\xrightarrow{{{0}^{o}}-{{5}^{o}}C}\] \[{{C}_{6}}{{H}_{5}}\overset{+}{\mathop{{{N}_{2}}C{{l}^{-}}}}\,+2{{H}_{2}}O\] aromatic primary amines, so undergo diazotisation but \[{{C}_{6}}{{H}_{5}}C{{H}_{2}}N{{H}_{2}}\] (aliphatic amine) will not undergo diazotisation.You need to login to perform this action.
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