In a similar experiment, unlabeled 4-butanolide was allowed to stand in an acidic
Chapter 19, Problem 19.8(choose chapter or problem)
In a similar experiment, unlabeled 4-butanolide was allowed to stand in an acidic solution in which the water had been labeled with 18O. When the lactone was extracted from the solution after four days, it was found to contain 18O. Which oxygen of the lactone do you think became isotopically labeled?
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer