Explanation

(c)
Ethanol on reaction with bleaching powder, gives chloroform (trichloromethane).
$CaOCl_{2}\ + \ H_{2}O\ \rightarrow \ Ca(OH)_{2}\ + \ Cl_{2}$
$C_{2}H_{5}OH\ + \ Cl_{2}\ \rightarrow \ CH_{3}CHO\ + \ 2HCl$
$CH_{3}CHO\ + \ 3Cl_{2}\ \rightarrow \ CCl_{3}\ .\ CHO\ + \ 3HCl$
$2CCl_{3}\ .\ CHO\ + \ Ca(OH)_{2}\overset{Chloral\ \ \ }{\rightarrow}\ 2{CHCl}_{3} + (HCOO)_{2}Ca$
chloroform