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SolutionsBrief History

1. Put them in order

Arrange these milestones in chronological order:

  1. The hexagonal structure of benzene.
  2. The discovery of nuclear magnetic resonance.
  3. The synthesis of urea.
  4. The tetrahedral carbon of van 't Hoff and Le Bel.
  1. The synthesis of urea (Wöhler, 1828).
  2. The hexagonal structure of benzene (Kekulé, 1865).
  3. The tetrahedral carbon (van 't Hoff and Le Bel, 1874).
  4. Nuclear magnetic resonance (Purcell and Bloch, late 1940s).

2. The end of a theory

Which theory was challenged by the synthesis of urea? Why?

Vitalism, or the theory of the vital force, according to which organic compounds could only be formed in living beings. Wöhler obtained urea, a compound of animal origin, from mineral substances.

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