Year 12s: what will be the first way you research your future options? >>

WJEC CH4 June 2015

Scroll to see replies

What did people put for the first question? I put blue lower lower but not sure if the lowers are right?

That's what I put too

Posted from TSR Mobile

Reply 81

zigzag12

What did people get for compound W? I got a c=c 3 ethyl, 1 methyl group I fear like I did a big mistake though! It annoyed me how little of the regents came up and not to mention that 4 marker on Compound 1/2/3. I managed to analyse them but was completely flustered at making the compound.

Reply 82

Maxmeisterrr

[QUOTE="HG_07;56843319"]

Original post by Maxmeisterrr

What did people put for the first question? I put blue lower lower but not sure if the lowers are right?

That's what I put too

Posted from TSR Mobile

Thank God🙏

Posted from TSR Mobile

Reply 83

Rhetorical Hips

First question was blue-higher-higher.

Compound W was 2,3-dimethylhex-2-ene or something like that, with 3 methyl groups and one ethyl group.

Reply 84

Rhetorical Hips

If benzene absorbs UV and nitrobenzene absorbs blue light, then benzene is absorbing light of higher energy and thus higher frequencies as E=hf

Reply 85

goodies

Wow i just realized I didnt answer the first NMR question because I didn't think there were hydrogens on the benzene ring. That's what happens when you don't sleep before an exam lmao.

Reply 86

manjot97

Original post by Rhetorical Hips

If benzene absorbs UV and nitrobenzene absorbs blue light, then benzene is absorbing light of higher energy and thus higher frequencies as E=hf

Yes, that's what i put.

Reply 87

pussyandmaths

I got 2,3 dimethylhex-2-ene as well. Also got blue higher higher for first question. Can anyone remember a mechanism question? How many marks was it because I didn't see it.

Reply 88

Maxmeisterrr

What was the compound W question again?😣

Posted from TSR Mobile

Reply 89

Maxmeisterrr

Original post by pussyandmaths

I got 2,3 dimethylhex-2-ene as well. Also got blue higher higher for first question. Can anyone remember a mechanism question? How many marks was it because I didn't see it.

3 I think

Posted from TSR Mobile

Reply 90

Rhetorical Hips

Original post by pussyandmaths

I got 2,3 dimethylhex-2-ene as well. Also got blue higher higher for first question. Can anyone remember a mechanism question? How many marks was it because I didn't see it.

Electrophilic addition of H-Cl across double bond

Reply 91

steffanjones

Original post by Maxmeisterrr

What did people put for the first question? I put blue lower lower but not sure if the lowers are right?

Posted from TSR Mobile

Knew it was either higher higher or lower lower but wasn't sure which so put one of each to atleast get a mark :biggrin:

Reply 92

fraser97

Original post by Rhetorical Hips

The compound W alkene questions were rather funny, I can see them throwing some people off. The first part of section B was also difficult IMO, and the for the 1 marker on the last page, what is missing from the first bullet point, what did you guys write?

I put 'time spent refluxing' for that, and yeah, i wasn't a fan of the first part of section B.

Reply 93

Nephron97

That exam was a tough exam, there was less of just putting down what you know, and more understanding of principles of what they were explaining in the exam like the question an c triple bond c and the keystone questions!

Reply 94

fraser97

Original post by steffanjones

Knew it was either higher higher or lower lower but wasn't sure which so put one of each to atleast get a mark :biggrin:

We meet again Steffan :wink:

People in my school, myself included, agree it's Higher-Higher, something to do with absorbing UV rather than blue light?

Reply 95

manjot97

Original post by pussyandmaths

I got 2,3 dimethylhex-2-ene as well. Also got blue higher higher for first question. Can anyone remember a mechanism question? How many marks was it because I didn't see it.

YESSSSSSSS I had 2,3 di methyl hex-2-ene too. And i had higher higher on the first question. Yh there was a CH2 mechanism with addition of H-Br to an alkene by electrophilic addition.

Reply 96

steffanjones

Original post by Rhetorical Hips

First question was blue-higher-higher.

Compound W was 2,3-dimethylhex-2-ene or something like that, with 3 methyl groups and one ethyl group.

I got the same Compound W :smile:

what was the answer to the question underneath worth 1 mark? Had the name of a different compound asking why that couldn't be W

Reply 97

Rhetorical Hips

Original post by fraser97

I put 'time spent refluxing' for that, and yeah, i wasn't a fan of the first part of section B.

Ah yeah that sounds like it's correct to me, I know others who put the same. I kind of was grasping at straws - I said conditions should be anhydrous, make sure they're mixed, attach vertical condenser... lol

Reply 98

pussyandmaths

What did everyone have as the empiral formula for the carboxylic acid? I had C2H502?

Reply 99

zigzag12

I also put time refluxing. I'm so annoyed at that compount W question I'm pretty sure I forgot to minus one of the spots by 1 before dividing it. My brain was in pieces by the end.