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4 marksFunctional Group Analysis, Reactions and Mechanisms

CAPE Chemistry Unit 2 · 2006 · Paper 2 · Question 6(b)(ii)

When acidified potassium chromate(VI) is added to an aqueous chloride, P, it changes from orange to green. P can also be used to change nitrobenzene (C₆H₅NO₂) to phenylamine (C₆H₅NH₂). Identify P and explain its role in both reactions.

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  1. 6(a)(i)Explain the trend in the bonding and acid/base character of the Group IV oxides in the +2 state.[6 marks]
  2. 6(a)(ii)Explain the trend in the behaviour of the Group IV tetrachlorides on reacting with water.[2 marks]
  3. 6(b)(i)A brown solid, J, heated with concentrated sulphuric acid reacts to give a white solid, K, and a colourless, odourless gas, L, which relights a glowing splint.…[6 marks]
  4. 6(b)(iii)Suggest what would be observed when aqueous P reacts with aqueous iron(III) chloride. Explain your answer.[2 marks]

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