What is the product formed when $1$-chlorobutane is treated with alcoholic potash $(KOH)$?

Which of the following is least reactive towards $SN^{1}$ reactions?

Which of the following alkyl halides gives only one product (excluding stereoisomers) when undergoing an $E_2$ reaction? $(E_2 = \text{elimination bimolecular})$

Which is a true statement concerning the transition state of an $S_N2$ reaction?

Which is the main organic product obtained by the reaction of $2,2,2-$trichloroethanol with calcium hydroxide?

The arrangement of the following compounds in the increasing order of their boiling points is:
$i$. bromomethane
$ii$. bromoform
$iii$. chloromethane
$iv$. dibromomethane