Discussion
The order of basic strength of following amines is
(i) CH3NH2 (ii) (C2H5)2NH (iii)C6H5NH2 (iv)C6H5NHCH3
Answer: E
The order is (iii) < (iv) < (i) < (ii).
In the aryl amines the nitrogen lone pair is delocalised into the benzene ring, so aniline (iii) and N-methylaniline (iv) are much weaker bases than the alkyl amines. The extra methyl group on N makes N-methylaniline slightly more basic than aniline.
Among the alkyl amines, diethylamine (ii), a secondary amine with two electron-releasing ethyl groups, is more basic in water than methylamine (i). Options putting an aryl amine above an alkyl amine reverse the effect of resonance.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development