(d)
$CH_{3}COOH\overset{\ \ CaCo_{3}\ \ \ }{\rightarrow}\left( CH_{3}COO \right)_{2}Ca$
‘A’
$\underset{- CaCo_{3}}{\overset{\ \ \ \ \ \ \ \mathrm{\Delta}\ \ \ \ \ \ \ }{\rightarrow}}\left( CH_{3} \right)_{2}CO\underset{{- H}_{2}O}{\overset{\ \ \ \ NH_{2}OH\ \ \ \ }{\rightarrow}}\left( CH_{3} \right)_{2}C = NOH$
acetoxime