Classify these alcohols as primary (1°), secondary (2°), or tertiary (3°). g

Left is primary Middle is secondary Right is tertiary Rule look at the carbon the 'OH' functional group is attached. If that carbon has two hydrogens then it is PRIMARY If that carbon has one hydrogen then it is SECONDARY If that carbon has no hydrogens then it is TERTIARY.

Remember that rust prevented by placing a sacrificial electrode in electrical contact with the iron. the sacrificial electrode must be composed of a metal that  oxidizes  more easily than iron (that is, it must be below iron in table 18.1).