Match the following:

Compound	Uses
$1$. $CaCO_3$	$a$. In preparation of oils and fats
$2$. $NaOH$	$b$. As an antiseptic
$3$. $Ca(OH)_2$	$c$. As an antacid
$4$. $NaHCO_3$	$d$. For making bleaching powder

(C) The correct matches are:
$1$. $CaCO_3$ is used as an antacid $(c)$.
$2$. $NaOH$ is used in the preparation of soaps from oils and fats $(a)$.
$3$. $Ca(OH)_2$ is used for making bleaching powder $(d)$.
$4$. $NaHCO_3$ is used as a mild antiseptic in skin infections and as an antacid $(b)$.
Therefore,the correct sequence is $1-c, 2-a, 3-d, 4-b$.