Draw the condensed structural formula, or line-angle formula if cyclic, for each of the following:
b. 3-pentanethiol

A condensed structural formula is a way of representing a chemical compound that shows the arrangement of atoms and the connectivity between them without depicting all the bonds explicitly. In this format, groups of atoms are often grouped together to simplify the representation, making it easier to visualize the molecular structure. For example, in 3-pentanethiol, the condensed formula would indicate the presence of a thiol (-SH) group attached to the third carbon of a five-carbon chain.

The line-angle formula, also known as the skeletal formula, is a shorthand representation of organic molecules where vertices represent carbon atoms and lines represent bonds. This method omits hydrogen atoms attached to carbons, making it easier to visualize larger and more complex structures. For cyclic compounds, this format is particularly useful as it clearly shows the ring structure and connectivity without cluttering the diagram with unnecessary details.

Functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules. In the case of 3-pentanethiol, the functional group is the thiol group (-SH), which imparts unique properties such as odor and reactivity. Understanding functional groups is essential for predicting the behavior of organic compounds and for drawing their structural representations accurately.