Problems and exercisesRecent Milestones

1. Two lactic acids

Why does the tetrahedral carbon of van 't Hoff and Le Bel explain the existence of two lactic acids with the same properties, except for their effect on polarized light?

2. Match them

Match each researcher with his contribution:

1. Pasteur
2. Pauling
3. Barton
4. Purcell and Bloch

Conformational analysis · nuclear magnetic resonance · nature of the chemical bond · separation of tartrate crystals