What is the product of the hydrolysis of trichloromethane with $KOH$?

Explain the mechanism of the bimolecular nucleophilic substitution $(S_N2)$ reaction with the example of $CH_3Cl$.

Observe the following reactions. The order of reactivity of $x, y, z$ towards $S_{N}1$ reaction is:

Vinylcyclopentane $\xrightarrow{HCl}$ Major product is

Given below are two statements:
Statement-$I$: High concentration of strong nucleophilic reagent with secondary alkyl halides which do not have bulky substituents will follow $S_{N}2$ mechanism.
Statement-$II$: $A$ secondary alkyl halide when treated with a large excess of ethanol follows $S_{N}1$ mechanism.
In the light of the above statements,choose the most appropriate from the options given below:

Alkyl halides react with dialkyl copper reagents (Gilman reagents) to give: