The reactivity of the halogen atom is minimum in:

Which of the following compounds will produce the product shown in the image upon reaction with $NaCN$ via an $S_N2$ mechanism?

Arrange the compounds of each set in order of reactivity towards $S_{N}2$ displacement:
$(i)$ $2-Bromo-2-methylbutane$,$1-Bromopentane$,$2-Bromopentane$
$(ii)$ $1-Bromo-3-methylbutane$,$2-Bromo-2-methylbutane$,$2-Bromo-3-methylbutane$
$(iii)$ $1-Bromobutane$,$1-Bromo-2,2-dimethylpropane$,$1-Bromo-2-methylbutane$,$1-Bromo-3-methylbutane$.

An isomer of $C_3H_6Cl_2$ gives acetone on heating with aqueous $KOH$. This isomer is .......

When $tert$-butyl bromide is heated with silver fluoride,the major product obtained is:

The reaction of a mixture of two organic compounds with $Na$ in ether gives $isobutane$ as a product. The two chlorine compounds are: