When chloroform is exposed to air and sunlight,it gives ...... .

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 $:$

The ease of dehydrohalogenation of alkyl halide with alcoholic $KOH$ is:

$C_2H_5Br$ $\xrightarrow{KCN} A$ $\xrightarrow{\text{Hydrolysis}} B$
The compound $A$ in the above reaction is

Which of the following are correct statements about $C_2H_5Br$?

Which reagent is used to convert an $Alkyl \ halide$ $(R-X)$ into an $Alkyl \ nitrite$ $(R-O-N=O)$?