An isomer of $C_3H_6Cl_2$ on boiling with aqueous $KOH$ gives acetone. Hence,the isomer 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:

Isopropyl chloride undergoes hydrolysis by which mechanism?

The order of relative reactivity of the given halides towards $S_N1$ reaction is:

Which of the following is boiled with ethyl chloride to form ethyl alcohol?

Predict the order of reactivity of the following compounds in $S_N1$ reaction :
$(I)$ $CH_3-CH_2-CH(Br)-CH_3$
$(II)$ $(CH_3)_2CH-CH_2-Br$
$(III)$ $(CH_3)_3CBr$