Question

How many compounds are less basic than aniline

$\left(\right.i\left.\right)$

$\left(\right.ii\left.\right)$

$\left(\right.iii\left.\right)$

$\left(\right.iv\left.\right)$ $NH_{3}$

$\left(\right.v\left.\right)$

$\left(\right.vi\left.\right)$

Answer 1

lone pair delocalized so less basic than aniline.



$-M$ effect of $-NO_{2}$ decrease the basicity so it is less basic than aniline.



$-CH_{3}$ group at ortho so ortho effect exert here hence basic character decrease as compare to aniline.



Lone pair of $-N$ involve in delocalization and ring become aromatic due to this so it is also less basic then aniline.

$NH_{3}$ is more basic then aniline because phenyl group exert $-I$ effect.

$\left(\right.v\left.\right)$ is derivative of guanidine so they are more basic than aniline.