Haloalkanes in the presence of alcoholic $KOH$ undergo:

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

The maximum number of $RBr$ isomers producing $2-$methylbutane by the given sequence of reactions is $...........$ $(Consider the structural isomers only)$

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

Assertion $A:$ Hydrolysis of an alkyl chloride is a slow reaction but in the presence of $NaI$,the rate of the hydrolysis increases.
Reason $R:$ $I^{-}$ is a good nucleophile as well as a good leaving group.
In the light of the above statements,choose the correct answer from the options given below.

Which of the following chloro-compounds shows complete inversion of configuration during a reaction?