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AQA CHEM 4 question

http://filestore.aqa.org.uk/subjects/AQA-CHEM2-QP-JAN13.PDF

Can someone explain 8b?

Why isn't the reaction nucleophilic addition-elimination?

Side note - Whats the process of forming an acid anhydride?

Also 2cii, sort of a long one but umm when you plug it into ka why don't use need to convert the moles into concentrations? Is it because the volume you have added will increase the total volume by the same so it just cancels?

And then question 5b - But I'll have a look at that again.

Thanks :smile:
Original post by Super199
http://filestore.aqa.org.uk/subjects/AQA-CHEM2-QP-JAN13.PDF

Can someone explain 8b?

Why isn't the reaction nucleophilic addition-elimination?



What's there to explain. It is nucleophilic substitution. The lone pair on the ammonia attacks the partially positive carbon holding the halogen, which then breaks off.




Side note - Whats the process of forming an acid anhydride?


don't understand the question. Anhydrides are formed in chemical reactions.



Also 2cii, sort of a long one but umm when you plug it into ka why don't use need to convert the moles into concentrations? Is it because the volume you have added will increase the total volume by the same so it just cancels?


The answer is T, as it's the only hydration (addition of water).

And then question 5b - But I'll have a look at that again.

Thanks :smile:


5b comes straight out of the notes on fermentation.
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Super199
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Original post by charco
What's there to explain. It is nucleophilic substitution. The lone pair on the ammonia attacks the partially positive carbon holding the halogen, which then breaks off.



don't understand the question. Anhydrides are formed in chemical reactions.




The answer is T, as it's the only hydration (addition of water).


5b comes straight out of the notes on fermentation.


Sorry my bad, I accidentally linked the wrong paper which is probably why you were wondering what was going on lol.
http://filestore.aqa.org.uk/subjects/AQA-CHEM4-QP-JAN13.PDF

That's is the actual one

Thanks
The nucleophilic addition-elimination reaction occurs to acid anhydrides and acyl chlorides in the process of acylation.The compound is 2-bromopropane so it doesn't undergo addition-elimination. As it's a haloalkane, that should be the notification that maybe think of AS mechanisms. :smile:

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