Which functional group does this picture represent?
A. a hydroxyl group
B. an amino group
C. a carboxyl group
D. a carbonyl group
![Which functional group does this picture represent A a hydroxyl group B an amino group C a carboxyl group D a carbonyl group class=](https://us-static.z-dn.net/files/dea/5a9e0663079b6a6b3d8d064ac888d36a.png)