Consider the following reactions:
i) $\mathrm{Glucose} +\mathrm{ROH}\stackrel{\mathrm{dryHC}l }{\to } \mathrm{Acetal}\underset{{\left({\mathrm{CH}}_3\mathrm{CO}\right)}_2\mathrm{O}}{\overset{\mathrm{x}. \mathrm{eq}.\mathrm{of} }{\to }}$acetyl derivative acetyl derivative
ii) $\mathrm{Glucose} \stackrel{\mathrm{Ni}/{\mathrm{H}}_2}{\to }\mathrm{A}\underset{{\left({\mathrm{CH}}_3\mathrm{CO}\right)}_2\mathrm{O}}{\overset{y.\mathrm{eq}.\mathrm{of}}{\to }} \mathrm{acetyl} \mathrm{derivative}$
iii) $\mathrm{Glucose} \frac{ \mathrm{z}.\mathrm{eq}.\mathrm{of} }{{\left({\mathrm{CH}}_3\mathrm{CO}\right)}_2\mathrm{O}}\to \mathrm{acetyl} \mathrm{derivative}$
‘x’, ‘y’ and ‘z’ in these reactions are respectively.