The order of reactivities of methyl halides in the formation of Grignard reagent is

The increasing rate of $S_N1$ reaction in the following compounds is:

The reaction of $n$-propyl bromide with ethanolic potassium hydroxide $(KOH)$ produces ...... .

Predict the order of reactivity of the following four isomers towards $S_{N}2$ reaction.
$(I)$ $CH_{3}CH_{2}CH_{2}CH_{2}Cl$
$(II)$ $CH_{3}CH_{2}CH(Cl)CH_{3}$
$(III)$ $(CH_{3})_{2}CHCH_{2}Cl$
$(IV)$ $(CH_{3})_{3}CCl$

Consider the reaction sequence given below. Which of the following statements is true?

Identify the compound $(C)$ in the following reaction sequence:
$\gamma$-butyrolactone $\xrightarrow[(ii) SOCl_2]{(i) HCl} (A)$ $\xrightarrow[AlCl_3]{Ph-H} (B)$ $\xrightarrow{KOH/MeOH} (C)$