Which of the following nucleophiles will show minimum reactivity towards $S_N2$ reaction:

Identify the reagent used in the following conversion:
$CH_3CH_2Cl \xrightarrow{A} CH_3CH_2NO_2$ (Nitroethane)

In the alkaline hydrolysis of a tertiary alkyl halide by aqueous alkali,if the concentration of the alkali is doubled,then the reaction rate:

Which among the following statements is $TRUE$ about gammexane?

Which of the compounds will react faster in an $S_N1$ reaction?
$CH_3-CH_2-Cl$ and $C_6H_5-CH_2-Cl$

Identify the correct order for the given property for the following compounds. Choose the correct answer from the options given below:
$(A)$ Boiling Point: $CH_3CH_2Cl < CH_3CH_2CH_2Cl < CH_3CH_2CH_2CH_2Cl$
$(B)$ Density: $CH_3CH_2Br < CH_3CH_2Cl < CH_3CH_2I$
$(C)$ Boiling Point: $CH_3CH_2Br < (CH_3)_2CHBr < (CH_3)_3CBr$
$(D)$ Density: $CH_3CH(I)Br < CH_3CH_2CH_2Br < CH_3CH(Br)Cl$
$(E)$ Boiling Point: $CH_3CH_2CH_2CH_2Cl > (CH_3)_2CHCH_2Cl > (CH_3)_3CCl$