2 marksAcidic and Basic Character of Organic Compounds

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

The general formula for an aliphatic amine is RNH2.

State TWO reasons for the difference between the two pKb values in (b)(ii).

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Other parts of this question

1(a)(i)State the role of the UV radiation in the reaction.[1 mark]
1(a)(ii)Write equations to show the steps occurring in the propagation stage for the formation of dibromomethane from bromomethane.[2 marks]
1(b)(i)Write the expression for the basic dissociation constant, Kb.[2 marks]
1(b)(ii)The pKb values for ethylamine and phenylamine are 3.27 and 9.38 respectively. State which of these compounds is the stronger base.[1 mark]
1(c)(i)Suggest a value for Kb for ethanamide, CH3CONH2.[1 mark]
1(c)(ii)State a reason for your answer in (c)(i).[1 mark]
1(d)Complete Table 1 by inserting the appropriate observations for tests (i) to (iv).[5 marks]

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