Explanation:

- Nucleic acids: These are complex organic molecules that contain carbon and form the building blocks of life, such as DNA and RNA.

- Cyanides: These often contain a carbon-nitrogen bond and are considered inorganic in many contexts, especially when lacking hydrogen. They are sometimes an exception in organic chemistry.

- Propane: A hydrocarbon with a three-carbon chain, propane is a classic example of an organic compound.

- Methane: The simplest hydrocarbon, containing one carbon atom and four hydrogen atoms, is also considered organic.