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![[Post New]](/templates/default/images/icon_minipost_new.gif) 6 Apr 2008 10:40:28 IST
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| |  The correct increasing acid strengths is 1. X>Z>Y 2.Z<X>Y 3.X>Y>Z 4 . Z>X>Y |
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6 Apr 2008 16:44:09 IST
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ans is a becoz -COOH is acidic group it has to be fst then Z which is close to acidic part then y
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6 Apr 2008 19:06:47 IST
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Sir, R U sure about the answer?
I think the answer should be 4.
Although COOH is a strong acidic group, but +ve on N is quite unstable and it wud lose an H+ more easily and willingly than COOH.
So, Z shud be more acidic than COOH. And least acidic shud be Y becoz of high +I effect.
So the answer shud be Z>X>Y.
Am I wrong???
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6 Apr 2008 20:45:01 IST
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yes tha answer is 1..... i am sure....
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6 Apr 2008 20:47:39 IST
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U maybe sure, but why am I wrong.
Charged species are always less stable than uncharged ones. So in any case, Z will try to lost a H+ faster and more willingly than X.
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The quality of a person's life is in direct proportion to their commitment to excellence, regardless of their chosen field of endeavor.
It is during our darkest moments that we must focus to see the light.
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6 Apr 2008 21:25:55 IST
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no that isnt the case, mostly the COOH is way acidic than the NH3+. this may be bcos the system is in eqbm (?) but thats a sure fact
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6 Apr 2008 21:28:52 IST
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yup its a) for sure
COOH is more acidic than N+.
Z is very close to an e- withdrawing group so e- density on Z's N+ is lesser than the other N+.
!!!!!!!!!!!!!!!!!!!
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Varsha
be cool,
tomorrow is what we make it today,
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6 Apr 2008 21:53:28 IST
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COOH will be more acidic than protonated amine because the species that'll be formed after loss of proton will be resonance stabilized in case of acid.
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6 Apr 2008 21:56:10 IST
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OK,
If U think that COOH is more acidic that NH3+, then tell me this-
Br-Ph-NH3+
Br-Ph-COOH
(both the groups are para to each other in both compounds)
Which is more acidic of both?
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The quality of a person's life is in direct proportion to their commitment to excellence, regardless of their chosen field of endeavor.
It is during our darkest moments that we must focus to see the light.
Check out my blog at:
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6 Apr 2008 22:07:45 IST
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yes i m very much sure. Ka for NH3+ is 10-10 whereas for -COOH its 10-3 NH3+CHRCOOH------>NH3+CHRCOO- + H+
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6 Apr 2008 22:15:45 IST
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But sir Ka for -
Br-Ph-NH3+ = 3.9
Br-Ph-COOH =4.0
So, how to explain this????????
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The quality of a person's life is in direct proportion to their commitment to excellence, regardless of their chosen field of endeavor.
It is during our darkest moments that we must focus to see the light.
Check out my blog at:
http://tarinbansal.blogspot.com/
(A must see for every student)
Back to goiit, this time with Baby Veerappan. :D |
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7 Apr 2008 02:57:51 IST
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kb for aromatic amine is less (10-10) than that of -COO- (10-9) thats y -COO- can be easily protonated then aromatic -NH2 ...or u can say that -COO- is stronger base than aromatic -NH2. so if its difficult to protonate AROMATIC -NH2 toh NH3+ fatak se dissociate ho jayega..ye aliphatic ka ikdam ulta hai...
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7 Apr 2008 03:28:33 IST
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n if its not clear then refer aminoacid chemistry frm ne book!!!
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