Which of the following alkyl halides gives the $S_{N}2$ reaction the fastest?

$6-$ In which case the order of boiling points of the organic molecules given below is correctly?

$C{H}_{3}C{H}_{2}F,C{H}_{3}C{H}_3,C{H}_{3}C{H}_{2}Cl,C{H}_{3}C{H}_{2}I$

a$.C{H}_{3}C{H}_3>C{H}_{3}C{H}_{2}F>C{H}_{3}C{H}_{2}I>C{H}_{3}C{H}_{2}Cl$

b$.C{H}_{3}C{H}_{2}I>C{H}_{3}C{H}_{2}Cl>C{H}_{3}C{H}_{2}F>C{H}_{3}C{H}_3$

c$.C{H}_{3}C{H}_3>C{H}_{3}C{H}_{2}F>C{H}_{3}C{H}_{2}Cl>C{H}_{3}C{H}_{2}I$

d$.C{H}_{3}C{H}_{2}F>C{H}_{3}C{H}_{2}Cl>C{H}_{3}C{H}_{2}I>C{H}_{3}C{H}_3$

In which case the configuration of the following compound is given correctly?

a$.$ Z$-$

b$.$ cis$-$

c$.E-$

d$.$ trans$-$

The reaction of carboxylic acids with alcohols catalysed by conc. $H_{2}S{O}_4$ is called

a$.$ Dehydration

b$.$ Saponification

c$.$ Esterification

d$.$ Neutralization

Which of the following reagents should be used to perform the following reactions?

$\backslash$table$[[,$i$,$ii$],[$a$.,K_{2}C{r}_2{O}_7,H_{2}S{O}_4,LiAl{H}_4$