$(ii)$ Glucose $\xrightarrow{{Ni/{H_2}}}A\xrightarrow[{{{\left( {C{H_3}CO} \right)}_2}O}]{{y\,Eq}}$ Acetyl derivative

$(iii)$ Glucose $\xrightarrow[{{{\left( {C{H_3}CO} \right)}_2}O}]{{z\,Eq}}$ Acetyl derivative due to presence of $- OH$ group in Glucose the reaction is

$(ii)$$\begin{array}{*{20}{c}} {CH = O\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ {{{\left( {CH - OH} \right)}_4}} \\ {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ {C{H_2} - OH\,\,\,\,\,\,} \end{array}$$\xrightarrow[{{H_2}}]{{Ni}}\begin{array}{*{20}{c}} {C{H_2} - OH\,\,\,\,\,\,\,\,\,\,} \\ {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ {{{\left( {CH - OH} \right)}_4}\,\xrightarrow[{A{c_2}O}]{{6\,Eq.}}} \\ {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ {C{H_2} - OH\,\,\,\,\,\,\,\,\,\,\,\,\,} \end{array}$

$\begin{array}{*{20}{c}} {C{H_2} - OAc\,\,\,\,\,\,\,} \\ {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ {\left( {C{H_2} - OAc} \right)} \\ {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ {C{H_2} - OAc\,\,\,\,\,\,} \end{array}$