$$\begin{gathered} {\mathrm{C}}_2{\mathrm{H}}_5-{\mathrm{NO}}_2 \stackrel{{\mathrm{LiAlH}}_4}{\to } \mathrm{X} ; \\ {\mathrm{C}}_6{\mathrm{H}}_5-{\mathrm{NO}}_2 \stackrel{{\mathrm{LiAlH}}_4}{\to } \mathrm{Y} ; \end{gathered}$$

‘X’ and ‘Y’ are respectively

Azo compound ; Azo compound

Primary amine ; Primary amine 

Azo compound ; Primary amine 

Primary amine ; Azo compound