WCH0 QR Dynamic Papers Chemistry al Edexcel

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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)

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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)

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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)

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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)

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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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