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4 marksAcid/Base Equilibria

CAPE Chemistry Unit 1 · 2006 · Paper 2 · Question 2(a)(ii)

An organic compound, X, is subjected to chemical analysis and mass spectrometry to determine its structural formula. Some of the results of the chemical analysis are recorded in Table 1 below. Complete the table by writing the observations and inference that have been omitted.

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.

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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)(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]
  3. 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]
  4. 2(a)(v)Suggest a value for the pH of a solution of X.[1 mark]
  5. 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]
  6. 2(b)(i)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…[3 marks]
  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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