I know the following are alcohols. Are the primary, secondary or tertiary and what is the IUPAC name.

1. CH3CHCH2CH3
.......|
.......OH (OH falls directly underneath the "CH"

2. CH3CH2-O-hexagon shape (I can't draw this out)

3. CH3 which is branched down to CH-CH2-CH2-OH which has CH3 again underneath and branched out

1 is a secondary alcohol.

2 is not an alcohol since it has no C-OH group. They way you have it drawn it is an ether.
I can't tell what three is.

To determine the classification and IUPAC name of the given alcohols, we need to understand the structure and nomenclature of alcohols.

1. CH3CHCH2CH3
This alcohol has the functional group (-OH) attached to a carbon atom that is directly bonded to two other carbon atoms. The carbon bonded to the hydroxyl group is primary (1°). Therefore, this alcohol is a primary alcohol. According to IUPAC nomenclature, the IUPAC name for this alcohol is butan-1-ol.

2. CH3CH2-O-hexagon shape
Based on the description, it seems that this alcohol is a cyclic alcohol with a six-membered ring. Cyclic alcohols can be classified by counting the number of carbon atoms directly bonded to the hydroxyl group. In this case, there is only one carbon atom bonded to the -OH group, meaning it is attached to one other carbon. Therefore, this alcohol is a secondary alcohol. Since you didn't provide the specific structure or substitution pattern of the hexagon, it is not possible to determine the IUPAC name accurately without additional information.

3. CH3 - CH - CH2 - CH2 - OH
|
CH3
The structure you described has a hydroxyl group (-OH) attached to a carbon that is bonded to three other carbons. The carbon bonded to the hydroxyl group is tertiary (3°). Therefore, this alcohol is a tertiary alcohol. According to IUPAC nomenclature, the IUPAC name for this alcohol is 2-methylpentan-3-ol. The name indicates that there is a methyl group (CH3) attached to the second carbon atom.

Remember, the IUPAC naming system follows specific rules to name organic compounds systematically. It involves identifying the longest carbon chain and numbering the atoms to locate any functional groups or substituents accurately.