Edexcel A2 Chemistry Exams -6CH04 (14th June) and 6CH05 (22nd June) Discussion Thread

No I think you're right, I don't think it was a secondary alcohol I think it was primary just the OH was on the right and the carbon had 2 other hydrogen atoms bound to it

there was definitely a primary AND a secondary alcohol, an aldehyde and one other molecule. the primary alcohol and the aldehyde could be oxidised to a carboxylic acid.

Reply 1341

lfcrules

2

@cobalt I agree . With the substitution one it was symmetrical but even so that just means no optical isomer forms. A racemic mixture has to have teo different optical isomers in so surely it was the racemic mixture question .

Reply 1342

primadonnas

in the mcq, does the secondary alcohol as well as the ketone react with iodine to produce iodoform?

Reply 1343

jess.olo

7

Original post by lfcrules

@cobalt I agree . With the substitution one it was symmetrical but even so that just means no optical isomer forms. A racemic mixture has to have teo different optical isomers in so surely it was the racemic mixture question .

I put racemic mixture !? I don't understand how that's wrong

Reply 1344

MacroniCheese

2

Original post by primadonnas

in the mcq, does the secondary alcohol as well as the ketone react with iodine to produce iodoform?

Yes because the secondary alcohol could be oxidised to the methy ketone which would then react with the Iodine in presence of alkali

Reply 1345

jess.olo

7

Original post by primadonnas

in the mcq, does the secondary alcohol as well as the ketone react with iodine to produce iodoform?

no! has to have C=O and methyl group nearby. secondary alcohol doesn't have this

Reply 1346

_H_V

4

Pretty sure the aldehyde wasn't a methyl aldehyde so it wouldn't react with iodine in iodoform reaction

Reply 1347

MacroniCheese

2

Original post by _H_V

Pretty sure the aldehyde wasn't a methyl aldehyde so it wouldn't react with iodine in iodoform reaction

Ethanal is the only aldehyde that reacts via Iodoform.

Reply 1348

primadonnas

Original post by MacroniCheese

Yes because the secondary alcohol could be oxidised to the methy ketone which would then react with the Iodine in presence of alkali

yh i remember a question where you needed to know that being in one of the earlier past papers

Reply 1349

C0balt

16

Original post by ilovecake123

SAME! what have you got left to do- I've done every past paper and its annoying aqua maths only got harder in recent years so not all papers are representative of the real exam!

Cramming some inverse trig because I hate the graphs...
Have you had any AQA maths exam this year? I sat fp3 fp4 and m3 this year and oh my god M3 was the worst exam I've ever sat in my life. FP3 was really tough too

Original post by lfcrules

@cobalt I agree . With the substitution one it was symmetrical but even so that just means no optical isomer forms. A racemic mixture has to have teo different optical isomers in so surely it was the racemic mixture question .

Nice 👍

Reply 1350

primadonnas

Original post by _H_V

Pretty sure the aldehyde wasn't a methyl aldehyde so it wouldn't react with iodine in iodoform reaction

yh it wasnt

Reply 1351

Don Pedro K.

9

For the question about what type of radiation is used in NMR, I said electromagnetic radiation in the form of radio waves. that's right isn't it?

Reply 1352

dj3k

9

Hitler Reacts to Edexcel Unit 4 Chemistry June 2016
https://www.youtube.com/watch?v=ee9EtJZZRlg

Reply 1353

_H_V

4

Original post by MacroniCheese

Ethanal is the only aldehyde that reacts via Iodoform.

So only the ketone that was there would react in iodoform test right?

(edited 7 years ago)

Reply 1354

C0balt

16

Original post by _H_V

So only the ketone that was there would react in iodoform test right?

And the secondary alcohol

Reply 1355

_H_V

4

Original post by C0balt

And the secondary alcohol

Ahh damm

Reply 1356

gabby07

11

Original post by Don Pedro K.

For the question about what type of radiation is used in NMR, I said electromagnetic radiation in the form of radio waves. that's right isn't it?

I think it's just radio waves, but yes your answer would probably get the marks unless the examiner thought you were hedging your bets. (I would give it though :smile:

)

Reply 1357

CLGC98

6

What was the hazard of one of the named substances , and surely as they said named, you could only talk about Ammonium chloride or the hydrated barium thing ???