Concept:The basicity of amines depends on the availability of the lone pair on nitrogen for protonation.
In arylamines, this lone pair is delocalised into the aromatic ring, making it less available.
Explanation:Benzenamine, N-methylbenzenamine and N,N-dimethylbenzenamine are all arylamines.
In these compounds, the lone pair on nitrogen is conjugated with the benzene ring, reducing its availability for protonation.
Phenylmethanamine (
C6​H5​CH2​NH2​) is an aliphatic amine because the nitrogen is attached to a carbon chain, not directly to the ring.
Its lone pair is not involved in resonance with the aromatic ring.
Hence, phenylmethanamine can donate its lone pair more readily and is the strongest base among the given options.
Answer:Option B — Phenylmethanamine.
