The final product formed when ethyl bromide is treated with excess of alcoholic $KOH$ is

Which of the following is most reactive towards nucleophilic substitution reaction?

Identify the major product of the dehydrohalogenation of $CH_3-CH_2-CH(Br)-CH_3$ using an alcoholic base.

Arrange the following compounds in decreasing order of the rate of electrophilic addition reaction:
$(P)$ $p$-vinylbenzaldehyde
$(Q)$ $p$-vinylanisole
$(R)$ $p$-methylstyrene
$(S)$ $p$-dimethylaminostyrene

The following reaction is a/an:
$CH_3-CH_2-CH_2-Br \xrightarrow{KOH} CH_3-CH=CH_2 + KBr + H_2O$

The reaction of a mixture of two alkyl halides with sodium in ether gives $2-$methylpropane. The alkyl halides are: