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ALL CIE CHEMISTRY DOUBTS HERE !!
HUSH1994:
Thanks man,but no problem,i already solved it :)
Master_Key:
CIE Chemistry 9701 - O/N 2010
qp12
Question 22.
Please someone help and can you give me notes on reactions of aldehydes.
elemis:
--- Quote from: Master_Key on April 15, 2011, 12:18:03 pm ---CIE Chemistry 9701 - O/N 2010
qp12
Question 22.
Please someone help and can you give me notes on reactions of aldehydes.
--- End quote ---
In the first scenario you will EVENTUALLY get a 2-hydroxy carboxylic compound. Think in terms of nucleophilic adittion of a CN- ion and hence you should be able to determine the structure.
The second scenario is straight forward oxidation of an aldehyde to a carboxylic acid.
Master_Key:
--- Quote from: Ari Ben Canaan on April 15, 2011, 12:46:16 pm ---In the first scenario you will EVENTUALLY get a 2-hydroxy carboxylic compound. Think in terms of nucleophilic adittion of a CN- ion and hence you should be able to determine the structure.
The second scenario is straight forward oxidation of an aldehyde to a carboxylic acid.
--- End quote ---
Ari, I am getting the difference as 14. How could it be 16?
Can you plz explain.
elemis:
--- Quote from: Master_Key on April 15, 2011, 02:17:58 pm ---Ari, I am getting the difference as 14. How could it be 16?
Can you plz explain.
--- End quote ---
When you react an ethanal with HCN you get 2-hydroxy propanenitrile. Hydrolysis of this gives you 2- hydroxypropanoic acid (RMM = 90)
Oxidation of propanal gives propanoic acid (RMM =74)
Do the subtraction....
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