Qualification > Sciences
ALL CIE CHEMISTRY DOUBTS HERE !!
Dania:
Crap. Sorry about that. It's question 5 from May/June 2009 Paper 2, Variant 2. Please check it out and get back to me.
missbeautiful789:
Attached is the answer from the marking scheme.
It makes sence to work backwards from U.
Add an -OH and an -H to the alkene.....then your done
I can't explain the mechanism..if they say they react, then i believe them...i just know how to find the product
Aldehydes react with each other apparently.
Deadly_king:
--- Quote from: Dania on October 30, 2010, 08:54:40 pm ---Crap. Sorry about that. It's question 5 from May/June 2009 Paper 2, Variant 2. Please check it out and get back to me.
--- End quote ---
Yeah..........you have only one choice here. You need to work back from U.
It has been said that T contains one OH group and form U, we may easily identify the presence of an aldeyde group. However it cannot be the conversion of a primary alcohol to an aldehyde since we can note that T has 2 oxygen atoms.
So it is bound to contain an OH group on one of the carbon carrying the C=C.
T is converted into U by using concentrated sulfuric acid which is a dehydrating agent and will cause the elimination of water from T top form U
Type of reaction : Elimination reaction or dehydration.
b) U contains two functional groups. You can name any one of them and identify them using the appropriate substance.
Example :
Alkene -----> It decolourises bromine.
Ketone -----> It gives an orange precipitate with 2,4 DNPH
Hope it helps :)
Dania:
Thank you, it did.
Aadeez || Zafar:
No more doubts frm u all
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