The important insecticide compound obtained by the reaction of chloral with chlorobenzene is......

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

Which of the following is most reactive towards dehydrohalogenation?

The highest peak in the energy profile diagram for the mechanism of alkaline hydrolysis of tertiary butyl bromide represents:

Dehydrohalogenation of an alkyl halide is a/an

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