Pharmacy Curriculum Outcomes Assessment (PCOA) Practice Exam

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Tautomers are isomers that:

  1. Have different molecular formulas

  2. Look similar, but one may have a double bond and the other a single bond

  3. Differ only by the position of a hydrogen atom

  4. Are mirror images of each other

The correct answer is: Look similar, but one may have a double bond and the other a single bond

Tautomers are isomers that differ in the placement of functional groups, while having the same molecular formula. Option A is incorrect because tautomers have the same molecular formula, but differ in their functional groups. Option C is incorrect because tautomers can differ in more than just the position of a hydrogen atom. Option D is incorrect because tautomers are not mirror images, rather, they have different functional groups. Option B is the correct answer because tautomers have the same atoms, but the arrangement of their double or single bonds differs.

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