Haloalkanes Questions

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) : 1-iodobutane undergoes ${\text{S}}_{\text{N}}2$ reaction faster than 1-chlorobutane.Reason (R) : Iodine is a better leaving group because of its large size.In the light of the above statements, choose the correct answer from the options given below :

Assertion : Rate of hydrolysis of methyl chloride to methanol is higher in $\text{DMF}$ than in water.Reason : Hydrolysis of methyl chloride follows second order kinetics.

The correct order of increasing reactivity of $\text{C-X}$ bond towards nucleophile in the following compound is:

Which compound undergoes nucleophilic substitution reaction most easily?

Which of the following compounds will undergo racemisation when a solution of $\text{KOH}$ hydrolyses them?

In an $S_{N}1$ reaction on chiral centres, there is:

Which of the following reaction(s) can be used for the preparation of alkyl halides?(i) ${\text{CH}}_3{\text{CH}}_2\text{OH}+\text{HCl}\stackrel{{\text{Anhyd. ZnCl}}_2}{\to }$ (ii) ${\text{CH}}_3{\text{CH}}_2\text{OH}+\text{HCl}⟶$ (iii) $({\text{CH}}_3{)}_3\text{COH}+\text{HCl}⟶$ (iv) $({\text{CH}}_3{)}_2\text{CHOH}+\text{HCl}\stackrel{{\text{Anhyd. ZnCl}}_2}{\to }$

Consider the reaction:
$${\text{CH}}_3{\text{CH}}_2{\text{CH}}_2\text{Br}+\text{NaCN}\to {\text{CH}}_3{\text{CH}}_2{\text{CH}}_2\text{CN}+\text{NaBr}$$
This reaction will be the fastest in: