This discussion is now closed.

Check out other Related discussions

2 chem ques.

Propanal can be cnverted into sodium propanoate in 2 steps- state reagents and conditions.
(Is that with iodine and NaOH?)

Propanone can be converted into methyl 2-methylpropenoate, the monomer for production of poly(methyl-2-methylpropenoate), ie. perspex. How is the polymer made?

Thanks for your help!

Reply 1

idiopathic

15

Propanal -> sodium propanoate:
i. Reflux the propanal with an oxidising agent, potassium dichromate, to convert it to propanoic acid.
ii. Then add sodium hydroxide to convert the acid to sodium propanoate.

Reply 2

Mimo

OP

endeavour

Propanal -> sodium propanoate:
i. Reflux the propanal with an oxidising agent, potassium dichromate, to convert it to propanoic acid.
ii. Add sodium hydroxide to convert to sodium propanoate.

Thanks, endeavour- you always end up answering all my question, which I really appreciate.

Any ideas on the polymer part anyone?

Reply 3

Mimo

OP

This is from a past paper, and (unless mine eyes deceive me) it is without a doubt printed as methyl 2-methylpropenoate.

Reply 4

idiopathic

15

I'm not sure about the actual answer to the polymer q, but the two molecules making up methyl 2-methylpropenoate would be methanol and 2-methylpropenoic acid (through a condensation reaction where water is ejected).

Reply 5

Mimo

OP

endeavour

I'm not sure about the actual answer to the polymer q, but the two molecules making up methyl 2-methylpropenoate would be methanol and 2-methylpropenoic acid (through a condensation reaction where water is ejected).

The monomer methyl 2-methylpropenoate has a formula of,
CH2=C(CH3)CO2CH3. Does that help? Would the CH3 group react?

Reply 6

BCHL85

12

I think it's addition reaction
CH3
|
nCH2=C(CH3)COOCH3 ---> -[-CH2-C-]-
|
COOCH3

Reply 7

idiopathic

15

BCHL85

I think it's addition reaction
CH3
|
nCH2=C(CH3)COOCH3 ---> -[-CH2-C-]-
|
COOCH3

I agree, it is. :smile:

So it's addition polymerisation (by free radical addition mechanism).

Reply 8

Mimo

OP

endeavour

I agree, it is. :smile:

So it's addition polymerisation (by free radical addition mechanism).

right... so how is polymerisation in the reaction of -CH2 and -CH3 (on the other side) a free radical addition reaction?

Reply 9

supreme

4

endeavour

I agree, it is. :smile:

So it's addition polymerisation (by free radical addition mechanism).

I get the same answer to :smile:

.

Mimo remember to be careful when giving organic reagents, to convert an aldehyde (RCHO) to a carboxylic acid (RCOOH) by oxidation you would reflux with an excess of acidified potassium dichromate(VI).

Reply 10

Mimo

OP

supreme

I get the same answer to :smile:

.

Mimo remember to be careful when giving organic reagents, to convert an aldehyde (RCHO) to a carboxylic acid (RCOOH) by oxidation you would reflux with an excess of acidified potassium dichromate(VI).

right- thanks!

Reply 11

MC REN

14

Is this AQA module 3?

Reply 12

Mimo

OP

MC REN

Is this AQA module 3?

EDEXCEL Unit 5

2 chem ques.

Related discussions

Articles for you