Which of the following is a functional group commonly found in organic molecules?

Which of the following is an example of a carbonyl functional group ($C_{=}O$)?

Which functional group is responsible for the umami flavor in amino acids?

Which of the following functional groups is commonly used as a key marker for the identification of bacteria?

In the context of organic chemistry, what is the role of a compound containing a ${\mathrm{hydroxyl}}_{}\mathrm{group}$?

Which of the following is a functional group commonly found in alcohols?

Which of the following is not an organic molecule?

Which of the following is not a functional group commonly found in organic molecules?