Main constituent of dynamite is

Which of the following alcohols cannot be prepared by the reaction of an acid chloride with an excess of a Grignard reagent followed by acidification?

In the following reaction sequence,the compound $I$ is:
$I (C_3H_6Cl_2)$ $\xrightarrow{KOH_{(aq)}} II$ $\xrightarrow{(i) CH_3MgBr, (ii) H_2O/H^{+}} III$ $\xrightarrow{Anhy. ZnCl_2 + Conc. HCl}$ gives turbidity immediately.

$CH_3-CH(OH)-CH_3$ $\xrightarrow{PBr_3}$ $A$ $\xrightarrow{Mg}$ $B$ $\xrightarrow{\text{Oxirane}}$ $C$ $\xrightarrow{H_2O}$ $D$. Here,$D$ is

Which of the following is a tertiary allylic alcohol?

Which of the following alcohols shows the fastest reaction with $HI$?