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Sagot :
Answer:
See attached picture.
Explanation:
Hello!
a) In this case, since oxygen there is present as C=O, as shown on the attached picture, we can see the following functional groups:
- Double bond (alkene).
- Amide group.
- Nitrile group.
b) In this case, since Et suggest an ethyl radical (CH3-CH2-) and the presence of those 2 oxygen atoms accounts for carboxyl, we have:
- Two carboxyl groups for an ethyl propanedioate ester.
Best regards!

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