• # question_answer 18) An organic compound is treated with $NaN{{O}_{2}}$ and dil. $HCl$at ${{0}^{o}}C$. The resulting solution is added to an alkaline solution of $\beta$ -naphthol where by a brilliant red dye is produced. It shows the presence of                                   A)  $-N{{O}_{2}}$ group         B)  aromatic $-N{{H}_{2}}$ group  C)  $-CON{{H}_{2}}$ group     D)  aliphatic $-N{{H}_{2}}$ group

${{C}_{6}}{{H}_{5}}N{{H}_{2}}+NaN{{O}_{2}}+HCl\xrightarrow[{{0}^{o}}C]{}{{C}_{6}}{{H}_{5}}N=NCl$