AQA A Level Organic Chemistry Addition Polymer Exam Question Help

Watch
Kizarkito
Badges: 7
Rep:
?
#1
Report Thread starter 1 month ago
#1
So I've spent about 45 mins trying to figure out this question (re-learnt naming amines and amides on YouTube lol) and I just don't understand it.

I think I may be drawing the monomer out wrong but I'm not sure. Here's the question:

Polymer M:

---- CH2 -- CH(CH3) -- CH2 -- NH -- CO -- CH2 -- CH(CH3) -- CH2 -- NH--CO -----

Give the IUPAC name of the monomer that forms polymer M.

Mark Scheme Answer:
4-amino-3-methylbutanoic acid

When I draw the mark scheme answer I get:
NH2 -- CH2 -- CH(CH3) -- CH2 -- COOH
And I can't see how this becomes polymer M.

Any help would be appreciated as this is stressing me out lol.

PM is open if need be thanks a lot
Last edited by Kizarkito; 1 month ago
0
reply
charco
Badges: 17
Rep:
?
#2
Report 1 month ago
#2
(Original post by Kizarkito)
So I've spent about 45 mins trying to figure out this question (re-learnt naming amines and amides on YouTube lol) and I just don't understand it.

I think I may be drawing the monomer out wrong but I'm not sure. Here's the question:

Polymer M:

---- CH2 -- CH(CH3) -- NH -- CO -- CH2 -- CH(CH3) -- CH2 -- NH--CO -----

Give the IUPAC name of the monomer that forms polymer M.

Mark Scheme Answer:
4-amino-3-methylbutanoic acid

When I draw the mark scheme answer I get:
NH2 -- CH(CH3) -- CH2 -- COOH
And I can't see how this becomes polymer M.

Any help would be appreciated as this is stressing me out lol.

PM is open if need be thanks a lot
I don't think that you have drawn the polymer correctly ...
0
reply
scimus63
Badges: 9
Rep:
?
#3
Report 1 month ago
#3
4-amino-3-methylbutanoic acid only appears once in the polymer structure as a possible monomer are you sure the polymer structure M is correct?
0
reply
Kizarkito
Badges: 7
Rep:
?
#4
Report Thread starter 1 month ago
#4
(Original post by charco)
I don't think that you have drawn the polymer correctly ...
(Original post by scimus63)
4-amino-3-methylbutanoic acid only appears once in the polymer structure as a possible monomer are you sure the polymer structure M is correct?
Ahhh I'm sorry, I missed out a "CH2" on the LHS of polymer M: CH(CH3) -- "CH2" -- NH

I also re-drew the structure of the mark scheme answer as I think I drew it wrong before too.

Unfortunately, the structure of the mark scheme answer (NH2 -- CH2 -- CH(CH3) -- CH2 -- COOH) still doesn't go with the monomer of polymer M I've drawn out (CH3 -- CH(CH3) -- CH2 -- NH -- CO -- OH) please correct me again if I'm wrong.

Thank you
0
reply
charco
Badges: 17
Rep:
?
#5
Report 1 month ago
#5
(Original post by Kizarkito)
So I've spent about 45 mins trying to figure out this question (re-learnt naming amines and amides on YouTube lol) and I just don't understand it.

I think I may be drawing the monomer out wrong but I'm not sure. Here's the question:

Polymer M:

---- CH2 -- CH(CH3) -- CH2 -- NH -- CO -- CH2 -- CH(CH3) -- CH2 -- NH--CO -----

Give the IUPAC name of the monomer that forms polymer M.

Mark Scheme Answer:
4-amino-3-methylbutanoic acid

When I draw the mark scheme answer I get:
NH2 -- CH2 -- CH(CH3) -- CH2 -- COOH
And I can't see how this becomes polymer M.

Any help would be appreciated as this is stressing me out lol.

PM is open if need be thanks a lot
-CO -- CH2 -- CH(CH3) -- CH2 -- NH-

Is the repeating unit

This can come from

HO-CO -- CH2 -- CH(CH3) -- CH2 -- NH2

The amine group can condense with the carboxylic acid group with the elimination of water.

Alternatively:

Cl-CO -- CH2 -- CH(CH3) -- CH2 -- NH2

In this case HCl is eliminated...
0
reply
Kizarkito
Badges: 7
Rep:
?
#6
Report Thread starter 1 month ago
#6
(Original post by charco)
-CO -- CH2 -- CH(CH3) -- CH2 -- NH-

Is the repeating unit

This can come from

HO-CO -- CH2 -- CH(CH3) -- CH2 -- NH2

The amine group can condense with the carboxylic acid group with the elimination of water.

Alternatively:

Cl-CO -- CH2 -- CH(CH3) -- CH2 -- NH2

In this case HCl is eliminated...
Ohhh I see! I was getting my repeating unit wrong...

Thank you so much for your help!
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

Do you think receiving Teacher Assessed Grades will impact your future?

I'm worried it will negatively impact me getting into university/college (74)
37.95%
I'm worried that I’m not academically prepared for the next stage in my educational journey (20)
10.26%
I'm worried it will impact my future career (12)
6.15%
I'm worried that my grades will be seen as ‘lesser’ because I didn’t take exams (48)
24.62%
I don’t think that receiving these grades will impact my future (25)
12.82%
I think that receiving these grades will affect me in another way (let us know in the discussion!) (16)
8.21%

Watched Threads

View All
Latest
My Feed