Qualification > Sciences
ALL CIE CHEMISTRY DOUBTS HERE !!
Amelia:
--- Quote from: Ari Ben Canaan on February 08, 2011, 02:41:52 pm ---I know the carbon with the red square is DEFINITELY chiral. Why is the one with the PINK square NOT chiral ?
--- End quote ---
It actually has three chiral's. The pink one you marked is a chiral as well. And also, the first Carbon. (CH-CH3)
--- Quote from: Ari Ben Canaan on February 08, 2011, 02:44:27 pm ---I dont understand. Are you talking about the right question ?
--- End quote ---
Mistook your question. I apologize.
elemis:
Last question, (e) part.
I drew the following compound, yet the markscheme shows something else altogether.
Would my answer be accepted ?
Deadly_king:
--- Quote from: Ari Ben Canaan on February 17, 2011, 04:37:02 am ---Last question, (e) part.
I drew the following compound, yet the markscheme shows something else altogether.
Would my answer be accepted ?
--- End quote ---
Sorry for lateness but I had to do the whole number to get the required answer.
So your answer will NOT be accepted. Tests 5 and 6 eliminates your answer completely. Now I'll explain :
For the compound you drew, upon test 5, it would get oxidised to a carbon dioxide and a carboxylic acid as the C=C will break. So the resulting carboxylic acid will give a positive result with the following test.(test 6)
Hence your answer is rejected.
elemis:
--- Quote from: Deadly_king on February 17, 2011, 05:15:36 am ---Sorry for lateness but I had to do the whole number to get the required answer.
So your answer will NOT be accepted. Tests 5 and 6 eliminates your answer completely. Now I'll explain :
For the compound you drew, upon test 5, it would get oxidised to a carbon dioxide and a carboxylic acid as the C=C will break. So the resulting carboxylic acid will give a positive result with the following test.(test 6)
Hence your answer is rejected.
--- End quote ---
2,4-DNPH gives a positive result only with Aldehydes or Ketones not Carboxylic acids.
Deadly_king:
--- Quote from: Ari Ben Canaan on February 17, 2011, 05:25:48 am ---2,4-DNPH gives a positive result only with Aldehydes or Ketones not Carboxylic acids.
--- End quote ---
That's true but before turning into a carboxylic acid......the compound will first be converted into an aldehyde. We need to oxidise much more for it to get converted to carboxylic acid.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version