The IUPAC name of the compound
`CH_(3) - undersetunderset(OH)(|)CH -CH_(2) - oversetoverset(CH_(3))(|)undersetunderset(Cl)(|)C-CH_(3)`

Options

A. 1,1-Dimethylbutane-1,3-diol
B. 1,3,3-trimethylpropane -1,3-diol
C. 4-chloro 4-Methyl pentan-2-ol
D. 1,3,3-Trimethyl-1,3-propanediol

Answer

To determine the IUPAC name of the given compound, we will follow a systematic approach:

### Step 1: Identify the Longest Carbon Chain
The first step in naming the compound is to identify the longest continuous carbon chain. In this case, the longest chain consists of 5 carbon atoms.

### Step 2: Determine the Parent Name
Since the longest chain has 5 carbon atoms, the parent alkane is named "pentane."

### Step 3: Number the Carbon Chain
Next, we need to number the carbon chain. The numbering should give priority to the functional groups and substituents. The OH group (alcohol) has higher priority than the substituents (methyl and chlorine).

- Start numbering from the end closest to the OH group:
- 1 - OH
- 2 - C
- 3 - C
- 4 - C (with substituents)
- 5 - C

This gives us the following positions:
- The OH group is on carbon 2.

### Step 4: Identify the Functional Group
The presence of the OH group indicates that this compound is an alcohol. In IUPAC naming, alcohols are indicated by replacing the "e" in the alkane name with "ol." Therefore, "pentane" becomes "pentanol."

### Step 5: Specify the Position of the Alcohol
Since the OH group is on carbon 2, we write this as "pentan-2-ol."

### Step 6: Identify and Name the Substituents
Now, we need to identify the substituents:
- There is a methyl group (−CH₃) and a chlorine atom (−Cl) both attached to carbon 4.

### Step 7: Alphabetical Order of Substituents
In IUPAC nomenclature, substituents are listed in alphabetical order regardless of their position numbers:
- Chlorine is named "chloro."
- Methyl is named "methyl."

Since "chloro" comes before "methyl" alphabetically, we will list them as:
- 4-chloro
- 4-methyl

### Step 8: Combine All Parts for the Final Name
Now, we combine the substituents with the parent name:
- The complete IUPAC name is "4-chloro-4-methyl-pentan-2-ol."

### Final Answer
The IUPAC name of the compound is **4-chloro-4-methyl-pentan-2-ol**.

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