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3 marksAcid/Base Equilibria

CAPE Chemistry Unit 1 · 2006 · Paper 2 · Question 2(b)(i)

An organic compound Y is also subjected to chemical analysis. Some of the results are presented in Table 2. Complete Table 2 by writing the tests and inference that have been omitted.

Complete Table 2, row (i) for the inference when Acidified KMnO4 is added to a few cm³ of Y, and the mixture is warmed, and the observation is colour changes from purple to colourless.

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  1. 2(a)(i)Complete Table 1, row (i) for the observation when an alkaline solution of silver nitrate is added to a few cm³ of X and the mixture is warmed, given the…[4 marks]
  2. 2(a)(ii)Complete Table 1, row (ii) for the observation when iodine and X are warmed with some NaOH in a test tube, given the inference is Methylketone.[4 marks]
  3. 2(a)(iii)Complete Table 1, row (iii) for the observation when X is added to a few cm³ of bromine in tetrachloromethane, given the inference is Alkene.[4 marks]
  4. 2(a)(iv)Complete Table 1, row (iv) for the inference when X is added to dilute HCl and white crystals are produced.[4 marks]
  5. 2(a)(v)Suggest a value for the pH of a solution of X.[1 mark]
  6. 2(a)(vi)The mass spectrum of X reveals that it has a RMM of 203. A prominent peak is also observed in the mass spectrum at m/z 77. Use this information and the results…[1 mark]
  7. 2(b)(ii)Complete Table 2, row (ii) for the test when the observation is white precipitate produced, and the inference is Phenol present.[3 marks]
  8. 2(b)(iii)Complete Table 2, row (iii) for the test when the observation is gas evolves which forms white fumes with NH3(g), and the inference is Carboxylic acid group.[3 marks]
  9. 2(b)(iv)The molecular formula for Y is found to be C9H10O4. Suggest a structural formula for Y.[1 mark]

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