Q. Comparing basic strength of $NH_{3},\ CH_{3}NH_{2}$ and $C_{6}H_{5}NH_{2}$ it may be concluded that
A) Basic strength remains unaffected
B) Basic strength of alkyl amines is lowest
C) Basic strength of aryl amines is lowest
D) Basic strength of $NH_{3}$ is highest
Explanation
(c)
Presence of methyl group increase the electron density on nitrogen. So, increases the basicity. Aniline is weaker base than the primary aliphatic amines and this may be explained by resonance. The lone pair of N is involved in resonance, thus not available for donation. That’s why basic strength of aryl amines (aniline) is lowest.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.