Quelpr
2 marksAcidic and Basic Character of Organic Compounds

CAPE Chemistry Unit 2 · May/June 2022 · Paper 2 · Question 1(b)(i)

Chloroethanoic acid dissociates in water according to the equation: CH₂ClCOOH + H₂O → CH₂ClCOO⁻ + H₃O⁺.

Write an expression for the Kₐ of chloroethanoic acid.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 1(a)(i)State the reagents and conditions for reaction I (from A to B).[2 marks]
  2. 1(a)(ii)State the reagents and conditions for reaction II (from A to C).[2 marks]
  3. 1(a)(iii)Draw the displayed structures and provide names for EACH of the following compounds: Compound D, Compound E.[4 marks]
  4. 1(b)(ii)Write an expression to show how pKₐ is derived from Kₐ.[1 mark]
  5. 1(c)(i)Complete Table 1 above by correctly inserting the pKₐ value of EACH compound from the following list of values: 1.48, 0.70, 4.76 and 2.86.[4 marks]
  6. 1(c)(ii)Give reasons for your assignments in (c)(i).[5 marks]
  7. 1(d)Account for the fact that the pKₐ of phenylamine is greater than that of ethylamine.[4 marks]
  8. 1(e)(i)Draw the structure of the monomer used to form polymer P and name the type of polymerization involved.[2 marks]
  9. 1(e)(ii)Draw the structures of the two compounds which react to form the polymer Q and name the type of polymerization involved.[3 marks]
  10. 1(e)(iii)Identify a compound which in aqueous solution will break down polymer Q but not polymer P.[1 mark]

More practice: the rest of this paper · more Acidic and Basic Character of Organic Compounds questions · all CAPE Chemistry Unit 2 past papers