OCR A Chemistry Paper 2 Unofficial Mark scheme

when it had the question about hydrogenation of the cyanide I put H2 as a reagent but not nickel, would you need nickel? or am i completely wrong?

when it had the question about hydrogenation of the cyanide I put H2 as a reagent but not nickel, would you need nickel? or am i completely wrong?

when it had the question about hydrogenation of the cyanide I put H2 as a reagent but not nickel, would you need nickel? or am i completely wrong?

I wrote that too but also dissolve in ethanol first, but many people are saying melting points .. so I'm unsure now

What was the answer to the multiple choice about 0.1 mol and 0.1 mol makes how many atoms?

I wrote about recrystallisation and filtration just forgot to say to check the melting point. would that still give me 2 ?

did you have to name the oxidised products of butanal and butanoic acid? bcuz i just drew them i forgot what the question asked

Agreed, it HAD to be phenol and ketone due to the chemical tests, so anything within the nmr is just supporting that view imo, all carbons found within the aromatic ring were found in the aromatic range, regardless of what they were bonded to

When it asked for functional groups, I put ketone and alcohol because at that point I didn't know it was phenol. I got the ketone-phenol thing for the next part, just wondered if alcohol is sufficient?

Nah I think that person doesn't know what they're talking about. Definitely up to 4, but apparently it also asked how to check the purity (but I don't think it did so maybe 6 marks is possible).

i got 4 chiral centres but im **** so im probably wrong

other questions i vaguely remember

butan-1-ol
the oxidation well it was distil to aldehye and reflux to COOH wasn't it? both with K2Cr2O7/H+



that recrystallisation was purity of benzoic acid after substituted with no2 + % yield



MCQS:
some bond angle ****

Alcohol alone doesn't explain the lower pH of 5 so I'm not sure

Slightly lower pH than 7 is explained by the weak acidity of phenol. Phenol will react with strong bases, but not weak bases such as sodium carbonate as illustrated by the observations.

I am aware of that, I was explaining that alcohol alone wouldn't get the mark but thanks

Yep its H2 and you need Ni catalyst

I believe chromatography wasn't necessary. I put filtration under reduced pressure followed by recrysalisation. Didn't it want to know how to purify it?

Why is it AgNO3 to measure the rate of activity/reaction? I put KCl because to see which one reacts fastest you need a displacement reaction? Cl displaces both iodine and bromine and then you can look at the speed... oh gosh

Is it necessary to put filtration under reduced pressure followed by recrystallisation? The question asked for the purification steps from the impure solid instead of from the reaction mixture, so I started off straight by putting the procedures of recrystallisation. Will I lose any marks?

Did we need to state structure of M and N