OCR A2 CHEMISTRY F324 and F325- 14th and 22nd June 2016- OFFICIAL THREAD

with alkaline hydrolysis of esters, will only the carbonyl group gain the negative charge or will the hydroxyl group gain a negative charge as well\?

It's the hydroxyl group that becomes negatively charged to form a carboxylate ion?

sorry don't think I was clear enough - I mean if a molecule has an ester group which is hydrolysed and also another hydroxyl group on the same molecule
So the hydroxyl group of the ester which has broken up and gain the Na+ but would the other OH group on the same molecule gain a Na+ as well?

No, not unless the hydroxyl group is attached to a benzene ring (phenol)

ohhh so if it was a phenol it would gain a Na+ aswell even if it doesn't say the NaOH was in excess?
I saw this on a question I was doing and the extra OH was on a phenol

Its definitely gonna be that hard. In 2013 the exam board got reviewed and they complained that the chemistry exams are too predictable and there are too many people getting high marks so they are mixing it up a bit. The only papers that are gonna be any reflection of what its gonna be like this year are June 14 and 15.

Don't panic. Look at reaction mechanisms that aren't on the specification but count as application of knowledge.Just check you understand them. If it comes up then you've already seen it and you can reel them off.
http://www.chemguide.co.uk/mechmenu.html#top

Look at these NMR Qs
Particularly the hardest ones.
https://www.tes.com/teaching-resource/ocr-chemistry-f324-module-3-nmr-practice-questions-6259747

maybe mess around with spectrum simulator at http://www.nmrdb.org/ Draw in a compound and test whether you can guess the number and position of peaks of h and C13 before you look. I think it's gonna be an alkene or an amide this year(maybe even a triglyceride or an azo dye). Everything else has come up.

Also, there are little tidbits in the book that might get examined. Like shorthand notation of fatty acids. Why substitution occurs and addition doesn't in benzene rings. Bonding in carbonyls. Basically, anything you haven't seen before is likely to come up as its last year of examination on this spec.

Hope that helps.

Yeah, I think so

What was the answer?

And phenols are able to react with Na and NaOH, but not Na2CO3

just to write the equation when OH- is added to a molecule which was containing an ester bond and a phenol

Hi does anyone have an f324 2015 attachment please I remember failing it for my mock

Just look on the last page

Last year's paper was actually hard... It had the questions I essentially failed on in my mocks lol

help with question C please?

help with question C please?

Can someone please explain to me why substitution reactions occur in Benzene but addition reactions do not?

When polymerising, H must be next to F or G because H contains two -OH groups and each of F and G contains two -COOH groups. You know that the proportion of F and G in the polymer is approximately equal, therefore your chain goes something like: -G-H-F-H-G-H-F-