Amines Part 1

Basicity ∝ electron pair intensity on nitrogen.
(III) Refer image 1 No resonance and + I effect from both sides ∴ most basic.
(II) Refer image. 2 Nitrogen do not involve in resonance ∴ more basic.
(I) Refer image.3 Nitrogen lone pair is involved in resonance. Therefore less available for donation. ∴ less basic.
(IV) Refer image.4
6πe−, Aromatic nitrogen lone pair participating in aromaticity
∴ less available for donation. : least basic.
∴ III > II > I > IV (Basicity order)