${\text{CH}}_{\text{3}}{\text{CHO}}_{\left(\mathrm{\ell }\right)}+\frac{1}{2}{\text{H}}_{\text{2\hspace{0.17em}}\left(\text{g}\right)}\underset{ }{\overset{\text{Ni}}{\to }}{\text{C}}_{\text{2}}{\text{H}}_{\text{5}}{\text{OH}}_{\left(\mathrm{\ell }\right)}$

$2{\text{\hspace{0.17em}C}}_{\text{graphite}}+3{\text{\hspace{0.17em}H}}_{\text{2\hspace{0.17em}}\left(\text{g}\right)}+\frac{1}{2}{\text{O}}_{\text{2\hspace{0.17em}}\left(\text{g}\right)}\to {\text{C}}_{\text{2}}{\text{H}}_{\text{2}}{\text{OH}}_{\left(\text{g}\right)}$

$2{\text{\hspace{0.17em}C}}_{\text{diamond}}+3{\text{\hspace{0.17em}H}}_{\text{2\hspace{0.17em}}\left(\text{g}\right)}+\frac{1}{2}{\text{O}}_{\text{2\hspace{0.17em}}\left(\text{g}\right)}\to {\text{C}}_{\text{2}}{\text{H}}_{\text{5}}{\text{OH}}_{\left(\text{g}\right)}$

$2{\text{\hspace{0.17em}C}}_{\text{graphite}}+3{\text{\hspace{0.17em}H}}_{\text{2\hspace{0.17em}}\left(\text{g}\right)}+\frac{1}{2}{\text{O}}_{\text{2\hspace{0.17em}}\left(\text{g}\right)}\to {\text{C}}_{\text{2}}{\text{H}}_{\text{5}}{\text{OH}}_{\left(\mathrm{\ell }\right)}$