a
\(\underset{cynide}{\mathop{\text{R}\,\text{-}\,\text{CN}}}\,\,\underset{{{H}^{+}}}{\mathop{\xrightarrow{{{\text{H}}_{\text{2}}}O}}}\,\,\underset{amide  }{\mathop{R\,-\,CON{{H}_{2}}}}\,\,\underset{{{H}^{+}}}{\mathop{\xrightarrow{{{\text{H}}_{\text{2}}}O}}}\,\underset{acid}{\mathop{\,R\,-\,\,COOH\,+\,N{{H}_{3}}}}\,\)