In the following sequence of reactions, \[\begin{align} & C{{H}_{3}}-\underset{\underset{N{{H}_{2}}}{\mathop{|}}\,}{\mathop{CH}}\,-C{{H}_{3}}\xrightarrow{HN{{O}_{2}}}A\xrightarrow{oxidation} \\ & B\xrightarrow[ii){{H}_{3}}{{O}^{+}}]{i)C{{H}_{3}}MgI}C \\ & \\ \end{align}\] The compound C formed will be