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1 markAcidic and Basic Character of Organic Compounds

CAPE Chemistry Unit 2 · 2014 · Paper 2 · Question 1(b)(ii)

The general formula for an aliphatic amine is RNH2.

The pKb values for ethylamine and phenylamine are 3.27 and 9.38 respectively. State which of these compounds is the stronger base.

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Other parts of this question

  1. 1(a)(i)State the role of the UV radiation in the reaction.[1 mark]
  2. 1(a)(ii)Write equations to show the steps occurring in the propagation stage for the formation of dibromomethane from bromomethane.[2 marks]
  3. 1(b)(i)Write the expression for the basic dissociation constant, Kb.[2 marks]
  4. 1(b)(iii)State TWO reasons for the difference between the two pKb values in (b)(ii).[2 marks]
  5. 1(c)(i)Suggest a value for Kb for ethanamide, CH3CONH2.[1 mark]
  6. 1(c)(ii)State a reason for your answer in (c)(i).[1 mark]
  7. 1(d)Complete Table 1 by inserting the appropriate observations for tests (i) to (iv).[5 marks]

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