5. CH3-CH-CH-CH-CH-CH=CH2 OH OH CH3 CH3

It looks like you're trying to describe a chemical structure using a textual representation. However, the notation appears a bit unclear.

From what I can decipher, it seems you may be describing an alcohol with a double bond. Specifically, the "OH" groups suggest that there are two hydroxyl groups, indicating that this could be a diol. The chain you've started with seems to have several carbon atoms, including a double bond (indicated by "CH=").

If you can clarify the structure or specify what exactly you need help with, such as naming the compound, its properties, or reactions, I'd be glad to assist you further!