Which of the following functional groups is characterized by a carbon atom double-bonded to an oxygen atom ($C=O$)?

When we begin studying functional groups, the designation of substitution will be especially important. Label the following bromoalkanes as 1° , 2°, 3°, or 4° based on the carbon to which the bromine is attached.

(b)

Which of the following functional groups is present in carboxylic acids?

Which functional group is responsible for the characteristic smell of $\mathrm{esters}$?

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

Which of the following functional groups is present in all amino acids?

Which of the following is not considered an organic molecule?

Which of the following functional groups is characterized by a carbonyl group bonded to a nitrogen atom? $(C=O)$ bonded to $N$