This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.

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Answer
2,2-dimethylpropan-1-ol
Here are the IUPAC names for the given compounds:
1)
Step 1: Identify the longest carbon chain containing the hydroxyl () group. The structure can be expanded as:
CH3
|
CH3 - C - CH2 - OH
|
CH3
The longest continuous chain containing the group has 3 carbons. This is a propane derivative.
Step 2: Number the carbon chain starting from the end closest to the group. The group is on the first carbon. The chain is: .
Step 3: Identify and name the substituents. There are two methyl () groups attached to carbon 2.
Step 4: Combine the information to form the IUPAC name. The parent alcohol is propan-1-ol. With two methyl groups at position 2, the name is 2,2-dimethylpropan-1-ol.
The IUPAC name is .
2) Cyclohexane with two groups
Step 1: Identify the parent ring and functional groups. The compound is a 6-membered carbon ring, which is a cyclohexane. It has two hydroxyl () groups, making it a diol.
Step 2: Number the ring to give the hydroxyl groups the lowest possible locants. The two groups are on adjacent carbons. Therefore, they are at positions 1 and 2.
Step 3: Combine the information to form the IUPAC name. The name is cyclohexane-1,2-diol.
The IUPAC name is .
3) Cyclopentane with four methyl groups
Step 1: Identify the parent ring and substituents. The compound is a 5-membered carbon ring, which is a cyclopentane. It has four methyl () groups attached to the ring.
Step 2: Number the ring to give the substituents the lowest possible locants. Starting from the top carbon as 1 and moving clockwise, the methyl groups are at positions 1, 2, 3, and 4. (C1: top, C2: top-right, C3: bottom-right, C4: bottom-left, C5: top-left).
Step 3: Combine the information to form the IUPAC name. There are four methyl groups, so "tetramethyl". Their positions are 1,2,3,4. The parent ring is cyclopentane. The name is 1,2,3,4-tetramethylcyclopentane.
The IUPAC name is .
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1) CH_3C(CH_3)_2CH_2OH Step 1: Identify the longest carbon chain containing the hydroxyl (OH) group.
This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.