The NH2 group in aniline is a strong electron-donating group, making it ortho and para directing in electrophilic aromatic substitution. Aniline does not undergo Friedel-Crafts reactions due to the formation of a complex with AlCl3, deactivating the benzene ring.
The portion of the line \( 4x + 5y = 20 \) in the first quadrant is trisected by the lines \( L_1 \) and \( L_2 \) passing through the origin. The tangent of an angle between the lines \( L_1 \) and \( L_2 \) is: