OCR Chemistry A F324 Rings, Polymers and Analysis Tue 19 June 2012

Reply 1980

booooo.. so i got it wrong ?

No. As long as your structure is correct you should get most of the marks, you'd just lose a mark for the wrong name (If it's the wrong name)

Reply 1981

gukl

I thought for the synthesis one you had to make the first compound from the second? Cos it said something like 'how can oxandralone be synthesised from compound C or whatever it was? I hope so haha! :frown:

For reduction with NaBH4 are there any conditions or is it just 'with NaBH4' ?

Reply 1982

clad in armour

16

Original post by Bethany01

booooo.. so i got it wrong ?

In january I think it said

IGNORE any names ....or words to that effect

that being said, its just safer to follow their instructions to the letter

Reply 1983

adilh301

Original post by niaghez

overkill??

I wrote too much for 1 mark yours seems fine

Reply 1984

DarkPeople

8

Original post by Bethany01

got the same structure , except named it 2phenylethly methanoate , did i get it wrong ? will they mark me down , even if i got the structure right ?

I was thinking that in the exam. I thought of methylbenzene and then thought of ethylbenzene. Don't think its given the phenyl prefix as the ethyl group is less reactive than the benzene ring. They shouldn't mark you down if it is not in the mark scheme.

Reply 1985

Fatima0065

5

Hey guys!

you kno for the 1 marker on how to get cl to NH3 is ethanolic ammonia okai or would you have to write reflux??? :smile:

Reply 1986

clad in armour

16

Original post by myyrh

No. As long as your structure is correct you should get most of the marks, you'd just lose a mark for the wrong name (If it's the wrong name)

not always, I think on the longer question a wrong doesnt con a correct formula

Reply 1987

Gman1234

6

Original post by DarkPeople

I was thinking that in the exam. I thought of methylbenzene and then thought of ethylbenzene. Don't think its given the phenyl prefix as the ethyl group is less reactive than the benzene ring. They shouldn't mark you down if it is not in the mark scheme.

Was the identifying the ester question 5b?

Reply 1988

otrivine

14

Original post by DarkPeople

They gave you the molecular ion peak at 164m/z which also the molar mass of the ester (164). Risk health could be anything cardiovascular related that isn't too obscure. So heart attacks, strokes, heart disease, CHD and stuff along those lines would be fine. Atherosclerosis should be ok in my books. And yeah join + water molecules. YOu had to make sure it was an open sequence though; left part would be -NH-R and the right part would be R-CO-. And your mechanism sounds about right and NO2

yep the condensation one put i had the benzene first and finsihed with o-- and did that , and the second part i removed hydrogen and got like a polymer but i did not extend the line for the benzene at the back at 4th postition do u get me ??? sorry for the unclear , and the question on degradbale i said making photosegradable

Reply 1989

Bethany01

Original post by myyrh

No. As long as your structure is correct you should get most of the marks, you'd just lose a mark for the wrong name (If it's the wrong name)

do you know what the name for it was? or anyone else ( the name of the ester )

I got phenylethyl ethanoate or somehing like that my ester could be formed from ethanoic acid and 2phenylethanol hopefully they overlook the attempt at naming D:

Reply 1992

Magickal

4

Did we need to name the ester?

Reply 1993

myyrh

9

Original post by clad in armour

not always, I think on the longer question a wrong doesnt con a correct formula

Well If you look at the long F322 analysis questions when you had to deduce structures it would say in the mark scheme (If name and structure is given both must be correct) So I'm basing it on that.

Reply 1994

Gman1234

6

Was the identifying the ester question 5b?

Reply 1995

Bethany01

Original post by adilh301

I got phenylethyl ethanoate or somehing like that my ester could be formed from ethanoic acid and 2phenylethanol hopefully they overlook the attempt at naming D:

i got that !! 2phenylethyle methanoate

(edited 11 years ago)

Reply 1996

DarkPeople

8

Original post by otrivine

yep the condensation one put i had the benzene first and finsihed with o-- and did that , and the second part i removed hydrogen and got like a polymer but i did not extend the line for the benzene at the back at 4th postition do u get me ??? sorry for the unclear , and the question on degradbale i said making photosegradable

Urm lol, as long as you remove a H from the -NH2 in one end and the OH from the -COOH in the other, you'd be fine. And photodegradeable seems about right.