The organic chloro compound,which shows complete stereochemical inversion during an $S_{N}2$ reaction,is

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

The correct order of boiling points of alkyl halides is:

The reaction of $3$-bromocyclohexene with $HBr$ yields $P_1$ and $P_2$ as major dibromo products. What is the relationship between $P_1$ and $P_2$?

Which of the following compounds will react with $Na$ to form $4,5-$diethyloctane?

When $CH_3CH_2CHCl_2$ is treated with $NaNH_2$,the product formed is