30 points
>
Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.
Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- IIT JAM
- Chemistry (CY)
Explainnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn
explainnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn
1 Answer(s)
Answer Now
- 1 Likes
- 1 Comments
- 0 Shares
-
![comment-profile-img]()
>
Do You Want Better RANK in Your Exam?
Start Your Preparations with Eduncle’s FREE Study Material
- Updated Syllabus, Paper Pattern & Full Exam Details
- Sample Theory of Most Important Topic
- Model Test Paper with Detailed Solutions
- Last 5 Years Question Papers & Answers
Sign Up to Download FREE Study Material Worth Rs. 500/-
Paramjeet verma![best-answer]()
Remember that decreasing pKb values can be alternatively said to be increasing pKa values (or decreasing acidity). Now, the groups attached to the first three molecules are e- withdrawing in nature and not electron donating (due to +ve charge) and thus they increase the acidity. Now since N is more electronegative followed by P ans As it withdraws electron density more strongly that others. ( Note: there will be no effect whether the substituent is located at meta or para positions as there is no possibility of electron de-localisation). Since there is no any electron withdrawing substituent in molecule(iv) so it is least acidic. Thus order of 'decreasing acidity' or 'increasing pKa values' or ' decreasing pKb values' is : (i) > (iii) > (ii) > (iv)