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1 markStructure and Formulae

CAPE Chemistry Unit 2 · 2009 · Paper 2 · Question 4(a)(i)b)

Alanine stereoisomerism and acid-base behavior.

Define 'Chiral centre'.

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  1. 4(a)(i)a)Define 'Stereoisomerism'.[1 mark]
  2. 4(a)(ii)Copy the displayed formula of alanine in your answer booklet. Place an asterisk (*) to identify the chiral centre AND state the type of isomerism exhibited.[2 marks]
  3. 4(a)(iii)Write the displayed formulae of the two isomers of alanine.[2 marks]
  4. 4(a)(iv)Write the displayed formula of the species present in aqueous solutions of alanine at: a) pH = 2, b) pH = 13, c) pH = 7.[4 marks]
  5. 4(b)(i)State the type of polymerisation involved in the formation of a dipeptide molecule.[1 mark]
  6. 4(b)(ii)Write the equation, using displayed formulae, to show the formation of the dipeptide molecule AND circle the peptide link.[3 marks]
  7. 4(b)(iii)Name the functional group represented by the peptide link.[1 mark]

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