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15. Halogen compounds
A section of Chemistry, 9701
Listing 10 of 284 questions
Ethanolamine and phenylamine are two organic bases that are industrially important. Ethanolamine is a useful solvent with basic properties, whilst phenylamine is an important starting material in the manufacture of dyes and pharmaceuticals. The following table lists some of their properties, together with those of propylamine. compound formula Mr boiling point/ °C solubility in water propylamine CH3CH2CH2NH2 fairly soluble ethanolamine HOCH2CH2NH2 very soluble phenylamine NH2 sparingly soluble Suggest why the boiling point of ethanolamine is much higher than that of propylamine. Draw a diagram to illustrate your answer. Describe and explain the relative basicities of propylamine and phenylamine. Write an equation showing ethanolamine acting as a Brønsted-Lowry base. Propylamine can be synthesised from bromoethane by the following route. CH3CH2Br CH3CH2CH2NH2 step 1 X step 2 Draw the structure of the intermediate compound X in the box above. Suggest reagents and conditions for step 1 step 2 Apart from their relative basicities, ethanolamine and phenylamine differ in many of their reactions. For each of these two compounds, describe one test that would give a positive result with the stated compound, but a negative result with the other. ethanolamine test observation phenylamine test observation
9701_s10_qp_41
THEORY
2010
Paper 4, Variant 1
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Questions Discovered
284