Q. The decreasing order of basic characters of the three amines and ammonia is
A) $NH_{3} > CH_{3}NH_{2} > C_{2}H_{5}NH_{2} > C_{6}H_{5}NH_{2}$
B) $C_{2}H_{5}NH_{2} > CH_{3}NH_{2} > NH_{3} > C_{6}H_{5}NH_{2}$
C) $C_{6}H_{5}NH_{2} > C_{2}H_{5}NH_{2} > CH_{3}NH_{2} > NH_{3}$
D) $CH_{3}NH_{2} > C_{2}H_{5}NH_{2} > C_{6}H_{5}NH_{2} > NH_{3}$
Explanation
(b)
Electron withdrawing groups (e.g., benzyl) because the basicity of amines. Electron donating groups (e.g., alkyl) increase the acidity of amines.
$\therefore$ The correct order of basicity of amines is
$C_{2}H_{5}NH_{2} > CH_{3}NH_{2} > NH_{3} > C_{6}H_{5}NH_{2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.