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Edexcel | Chemistry WCH0 | S 16 5 1 | 1 hour 45 minutes
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22
(a)
Add To Classified

IGNORE any additional structural

formulae as working

22
(a) (I)
Add To Classified
1 Mark

 The drug 3,4-dihydroxyphenylalanine, L-DOPA, is used in the treatment of Parkinson’s disease.

Give the molecular formula for L-DOPA.

 

22
(b)
Add To Classified
1 Mark

Suggest the organic product of the reaction between L-DOPA and excess

ethanoyl chloride

ALLOW any combination of

skeletal, displayed or structural

formulae

IGNORE bond angles

22
(c)
Add To Classified
2 Mark s

Give a chemical reaction and its result that can be used to show the presence of

the carboxylic acid group in L-DOPA.

In each pair, the observation is

conditional on a correct or ‘near miss’

reagent

IGNORE indicators

22
(d)
Add To Classified
2 Mark s

 Molecules of L-DOPA can polymerize to form a polyamide by condensation.

  Draw two repeat units of the polyamide formed from L-DOPA.

 

ALLOW any combination of displayed/

skeletal / structural formulae

ALLOW Kekulé structures

IGNORE bond angles / brackets and n

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