Which one of the following is least basic

3 > 4 > 2 > 1In (1) and (2) the lone pair of electrons of nitrogen atom are delocalized. Thus (1) and (2) are less basic, -CO||-group is a stronger EWG than -C6H5 group.∴ basic strength of benzamide < Aniline.Amide acquires some acidic character also.Amides are classified as acid derivatives.