$C_2H_5Cl + KCN$ $\xrightarrow{} X$ $\xrightarrow{\text{Hydrolysis}} Y.$
$X$ and $Y$ are:

Which is the correct decreasing order of boiling points for the following compounds?

Given below are two statements $:$
Statement $(I) :$ $cis-1,2-dichloroethene$ is more polar than $cis-1,2-dibromoethene$.
Statement $(II) :$ Boiling point of $trans-1,2-dibromoethene$ is lower than $cis-1,2-dibromoethene$ but it is more polar than $cis-1,2-dibromoethene$.
In the light of the above statements,choose the most appropriate answer from the options given below $:$

Identify the compound that undergoes $S_{N}1$ mechanism most rapidly.

An alkyl halide may be converted into an alcohol by

Which one of the following forms propane nitrile as the major product?