Organic compounds are distinguished by molecules that contain $C$ bonded to other elements.

Which element primarily forms the backbone (skeleton) of most organic compounds?

Which of the following organic molecules contains both an $\mathrm{amine}$ group and a $\mathrm{carboxyl}$ group?

Which of the following functional groups is characteristic of thiols?

Most organic compounds contain $C$ and _____.

Which of the following compounds contains a functional group with two oxygen atoms?

Which of the following best describes a benzylic carbon in organic molecules?

Which of the following functional groups can be synthesized using only $C_2{H}_2$ (acetylene) as the source of carbon atoms?

Which of the following sets correctly identifies four functional groups commonly found in organic molecules?