exceptions in organic chemistry!!!!!

well....organic a nightmare for many fun for others....a house of many exceptions to basic phenomenon n reactions is the beauty of ORGANIC CHEMISTRY!!!!!!!
so this thread is dedicated to those exceptions in organic chemistry!!!
both in reactions n in characteristic features of compounds.........hope this thread blossoms n goes ahead[1][1][1]

36 Answers

1
Ankur ·

@Aveek: nothing co-relating. It's just Test-Series. :D

29
govind ·

HCOOH..Formic Acid shows positive Tollen's and Fehling's test..

The attack of NO+ on benzene is faster than NO2+

In case of non-polar medium the formation of NO2+ is the slow step... and in case of polar solvents the removal of proton will be the slowest step in Nitration...
The vant hoff factor in Nitration mixture is ≈ 3.82

In case of Sulphonation the electrophile is SO3

1
abhishek sahoo ·

esters having one α - hydrogen do not undergo claisen condensation reaction..........

however with strong bases such as triphenylmethyl sodium, some esters like ethyl isobutyrate undergo claisen condensation ..

1
abhishek sahoo ·

not an exception but it's good to know these----

1
hacker ·

[1][1][1]nice work friends[1][1][1].thanx to u all......

P.S.yes,abhishek.......no such thing tht u only need to post exceptions any such thing which is rare to find n notice+exceptions+other properties+more........caN BE ADDED[1]

1
Ankur ·

@abhishek : for Claisen condensation : I didn't know that! But how can this be true. I mean, there is well defined reason why atleast 2 alpha hydrogen is required for Mr. Claisen... How will it attain equilibrium going with that fact..

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