Rank the following in order of increasking pKa, by placing a 1 under the compoun
ID: 861703 • Letter: R
Question
Rank the following in order of increasking pKa, by placing a 1 under the compound whose underlined hydorgen has the lowest pKa, and an 8 under the one with the highest pKa. This problem should not require a pKa table.
In order to get full points, you need to explain it fully. I am trying to actually understand this for a final tomorrow.
Rank the following in order of increasking pKa, by placing a 1 under the compound whose underlined hydorgen has the lowest pKa, and an 8 under the one with the highest pKa. This problem should not require a pKa table.Explanation / Answer
From most acidic to least acidic
1] N-C----H
2] CH-C----H
3]H2C-CH-----H
4] ----O---H
5] (CH3)2 ---N ----H
6]---H
7] ---CH2 ----H
8] Cyclic CH3-----H
As this is the order of acidic H
My reasons behind the solution are :
* Acidity of an hydrogen depends on the groups that are attached to the adjacent this means the ease with which the hydrogen or H+ can be removed from a compound helps us to find the acidity of a compound
* So now we see that the triple bonds are more electronegative than the double bonds and we can also differentiate that 3 degree C- will be unstale if H+ is removed from the compound so H+ is most difficult in that case .
*Now the order for pKa will be exactly the reverse of the acidity
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