Chemistry - GOC Question with Solution | TestHub

I is N,N-dimethylaniline; the lone pair on N participates in resonance with the benzene ring.

II is 2,6-dimethyl-N,N-dimethylaniline; the two ortho methyl groups cause steric inhibition of resonance (SIR).

Due to SIR, the lone pair on N in II is less delocalized and more available for protonation.

Therefore, II is more basic than I.

Hence Basic strength: I < II.