Question

To arrange the following compounds in the order of basicity:

Choose the correct answer from the options given below:

• (B) > (A) > (C) > (D)
• (D) > (C) > (B) > (A)
• (A) > (B) > (C) > (D)
• (C) > (D) > (A) > (B)

Hint:

Electron-donating groups increase basicity by increasing the electron density on the nitrogen, while electron-withdrawing groups decrease basicity.

Answer 1

The Correct Option is A

Basicity is determined by the electron-donating or withdrawing effects of substituents on the aniline ring. Methoxy groups are electron-donating, so Compound B is the most basic. The nitro group is electron-withdrawing, making Compound A the least basic. Chlorine is weakly electron-withdrawing, so Compound D is less basic than Compound B, and Compound C is less basic than B but more basic than A.