The action of nitrous acid on ethyl amine gives

Which one of the following compounds undergoes bromination of its aromatic ring (electrophilic aromatic substitution) at the fastest rate?

Among the isomeric amines,select the one with the lowest boiling point.

The major product formed in the reaction given below will be

When $(P)$ undergoes Hoffmann exhaustive methylation (twice) then the product obtained will be

The major product obtained in the reaction of aniline with acetic anhydride is