Explanation

(d)
A mixture of conc. HCl+ anhy Zn$Cl_{2}$ is called Lucas reagent. In Lucas test tertiary alcohols immediately give turbidity while secondary alcohols give turbidity after 5 min. Primary alcohols give no reaction with Lucas reagent at room temperature.
$CH_{3}OH/CH_{3}CH_{2}OH\overset{\ \ Conc.HCI + anhy\ ZnCI_{2}\ \ \ }{\rightarrow}$No reaction
Primary alcohol
and hence, no white cloudiness on turbidity at room temperature.
$\left( CH_{3} \right)_{2}CHOH\overset{\ \ \ Conc.HCI + anhy\ ZnCI_{2}\ \ \ \ }{\rightarrow}$
Secondary alcohol
White cloudiness or turbidity appears within about 5 min.
$\left( CH_{3} \right)_{3}COH\overset{\ \ Conc.HCl + anhy\ ZnCl_{2}\ \ \ }{\rightarrow}$ White cloudiness
Tertiary alcohol
Or turbidity appears immediately.