The two benzylic hydrogens \(\mathrm{H_A}\) and \(\mathrm{H_B}\) in the compounds I and II are
Question and options
The two benzylic hydrogens and in the compounds I and II are
- diastereotopic in I and enantiotopic in II
- homotopic in I and enantiotopic in II
- diastereotopic in both I and II
- enantiotopic in both I and II
Answer and explanation
Correct answer: B - homotopic in I and enantiotopic in II
In diphenylmethane (I) the two benzylic H are interchanged by a axis, so they are homotopic. In phenyl(3-pyridyl)methane (II) there is no axis but a mirror plane relates them, so they are enantiotopic.
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