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OCR F324-June 2013 Chemistry

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Not too bad!
I ran out of time so I didn't get to check my answers.
There were a few that were a bit strange but I just tried my best and put educated guesses when my brain failed :tongue:

How did you find it?

I think it was much better than january but I didn't like the weird random questions like the trans fats and the TMS...found them hard to word

Reply 2781

Myocardium

Original post by Brad0440

Like this?

My benzene ring was attached to the C with the two methyl groups instead of the C with the double bond :O Will I get marks for it?

Reply 2782

Myocardium

Original post by Taimmi

...did anyone else notice the mistake?

We had a notice read out for it. The typo 'identity' instead if 'identify' right?

Reply 2783

master y

Original post by ihatepeople37

at least 5

Original post by Gulzar

Quite a lot I'm afraid because the structure itself will be worth at least half of the available marks.

Really? At most i would lose 3 marks i think because only 3 marks are given for identifying the structure if you look at previous past papers. And i may gain some marks out of those 3 because i got the methyl groups and the benzene ring.

Reply 2784

Bazuka

Original post by Myocardium

Yesss!!! Was a benzene ring attached to a C; the C was attached to an O and C=O on one side and the other two sides had a methyl group each. So surprised I managed to get it seeing as I have NEVER managed to construct a molecule from NMR before.

The C=O was attached to a C with 1H and 2 Methyl groups I think :/

Reply 2785

Brad0440

Original post by ihatepeople37

Oh ****.... was it not phenol instead of benzene?

I don't think so, because then there would have been 3 oxygens and the molecular formula was C10H12O2

Reply 2786

master y

I think there was a lot in this exam to trick people out actually, i didn't think it was that easy

Reply 2787

Taimmi

Original post by Myocardium

We had a notice read out for it. The typo 'identity' instead if 'identify' right?

Yeah, we had that too. But we think there was another one in the percentage yield question.

Reply 2788

SLAYERRR

What did anyone get for the percentage yield question?

Reply 2789

andywilliamsRPGT

I got CH((CH3)2)C6H4COOH for the last one. Anyone else get this? The carbon 13 spectra did not show a C-O so it couldn't of been an ester, no?. Also 4x Aromatic environments. Agh. Think i messed it up lol

(edited 10 years ago)

Reply 2790

Bazuka

Original post by Myocardium

My benzene ring was attached to the C with the two methyl groups instead of the C with the double bond :O Will I get marks for it?

I think ur right :biggrin:

That's what I got too because of the splitting it has to be like that

Reply 2791

Brad0440

Did anyone get something like this for one of the questions? (I think it was something to do with an ester forming and then a small, inorganic compound (i.e. water))

Reply 2792

Myocardium

Original post by SLAYERRR

What did anyone get for the percentage yield question?

63.5% You?

Reply 2793

Bazuka

Original post by andywilliamsRPGT

I got CH(CH3)C6H4COOH for the last one. Anyone else get this? The carbon 13 spectra did not show a C-O so it couldn't of been an ester, no?. Also 4x Aromatic environments. Agh. Think i messed it up lol

One of the peaks linked to -COO

Reply 2794

Bazuka

Original post by Myocardium

63.5% You?

That's what I got :biggrin:

Reply 2795

dadams2

Original post by Brad0440

I don't think so, because then there would have been 3 oxygens and the molecular formula was C10H12O2

no i think the alcohol making up the ester was phenol. the ester group is the opposite way round to what everyone is saying. O was attached to the C on benzene

Reply 2796

Bazuka

Original post by dadams2

no i think the alcohol making up the ester was phenol. the ester group is the opposite way round to what everyone is saying. O was attached to the C on benzene

I agree

It was C6H5OOCH(CH3)2

Reply 2797

andywilliamsRPGT

Original post by Bazuka

One of the peaks linked to -COO

I thought that peak was a C6H5C(H) peak.

Reply 2798

username1078878

I initially thought there was a mistake on percentage yield as I thought the Mr given for compound e was wrong, talking to a friend after I realised I treated the bond coming out of the paper as an h when it was ch3, meaning the Mr of 160 was correct. I got 61.9 percent or something but I don't think that's right

Reply 2799

Yemiisii

Original post by Myocardium

The invigilator didn't have any but luckily a couple of students forgot their rulers and one student had a spare ruler so was fine. Dod you get 0.58 for the Rf value?