A) Acetic acid
B) Benzaldehyde
C) Acetone
D) \[\text{N}{{\text{H}}_{\text{3}}}\]
Correct Answer: B
Solution :
Both aliphatic and aromatic primary amines react with aldehydes and ketones catalysed by an acid to form azomethines called Schiffs base or anils. \[\underset{p-a\min e}{\mathop{R-N{{H}_{2}}}}\,+\underset{Aldehyde}{\mathop{O=\overset{H}{\mathop{\overset{|}{\mathop{C}}\,}}\,-R}}\,'\] \[\xrightarrow{{{H}^{+}}}R-N=\overset{H}{\mathop{\overset{|}{\mathop{C}}\,}}\,\underset{Schiffs\,base}{\mathop{-R'+{{H}_{2}}O}}\,\] (R = alkyl or aryl group ) \[RN-{{H}_{2}}+O=C\begin{matrix} R \\ R' \\ \end{matrix}\xrightarrow{{{H}^{+}}}\] \[\underset{Schiff's\,base}{\mathop{R-N=C\begin{matrix} R \\ R \\ \end{matrix}+{{H}_{2}}O}}\,\]
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