Consider the reactions:
$(i) \ (CH_3)_2CHCH_2Br \xrightarrow{C_2H_5OH} (CH_3)_2CHCH_2OC_2H_5 + HBr$
$(ii) \ (CH_3)_2CHCH_2Br \xrightarrow{C_2H_5O^-} (CH_3)_2CHCH_2OC_2H_5 + Br^-$
The mechanisms of reaction $(i)$ and $(ii)$ are respectively:

For the reaction of $3$-bromohexane with alcoholic $KOH$,find $(x)$,where $(x)$ is the total number of $E_2$ elimination products obtained (including stereoisomers).

Which compound might be synthesized by the $S_N2$ displacement of an alkyl-halide?

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:

Explain the concept of retention of configuration in a chemical reaction with an example.

Which $Cl$ atom is most susceptible to be attacked by aqueous $KOH$?