Which of the following undergoes hydrolysis most easily?

Match the reactants in Column-$I$ with the products in Column-$II$.

Column-$I$ (Reactants)	Column-$II$ (Products)
$(A) CH_3CH_2Br + Mg \xrightarrow{\text{dry ether}}$	$(i) \text{Cyclohexylmagnesium bromide}$
$(B) 2RX + 2Na \xrightarrow{\text{dry ether}}$	$(ii) CH_3CH_2MgBr$
$(C) CH_3CH_2Br \xrightarrow{\text{alc. KOH}}$	$(iii) R-R + 2NaX$
$(D) \text{Bromocyclohexane} + Mg \xrightarrow{\text{dry ether}}$	$(iv) CH_2=CH_2 + H_2O + KBr$

In the given reaction,$[X]$ will be:

When $32.25 \ g$ of ethyl chloride undergoes dehydrohalogenation,it yields $50\%$ of the theoretical alkene product. What is the mass of the product obtained in $g$? (Atomic mass: $Cl = 35.5, C = 12, H = 1$)

Consider the following $E_1/S_N1$ reaction. The missing product$(s)$ is(are):

What is the product of the Friedel-Crafts reaction of benzene with chloroform?