The IUPAC name of compound
`CH_(3)-CH_(2)CH(CH_(3))CH_(2)COCl` is

Options

A. 3-Methylpentanoyl choride
B. 3-Methylbutanoyl chloride
C. 1-Chloro-3-methylpentanol
D. None of these

Explanation

To determine the IUPAC name of the compound `CH₃-CH₂-CH(CH₃)-CH₂-COCl`, we will follow these steps:

### Step 1: Identify the Longest Carbon Chain
First, we need to identify the longest continuous carbon chain in the compound. The given structure can be represented as:
- CH₃ (1)
- CH₂ (2)
- CH (3, with a methyl group attached)
- CH₂ (4)
- COCl (5)

The longest chain consists of 5 carbon atoms.

### Step 2: Number the Carbon Chain
Next, we will number the carbon chain starting from the end nearest to the functional group (COCl). This ensures that the functional group gets the lowest possible number:
1. C1: CH₃
2. C2: CH₂
3. C3: CH (with CH₃ as a substituent)
4. C4: CH₂
5. C5: COCl

### Step 3: Identify the Substituents
At carbon 3, there is a methyl group (CH₃) attached.

### Step 4: Name the Compound
Now we can combine the information:
- The longest chain is a pentane (5 carbons).
- There is a methyl group at carbon 3.

Thus, the base name is "pentane," and we have a substituent "3-methyl."

### Step 5: Include the Functional Group
Since there is a chloroformyl group (COCl), we need to include this in the name. The presence of the COCl indicates that this is an acyl chloride. The complete name combines the base name with the functional group:
- The full name is "3-methylpentanoyl chloride."

### Final Answer
The IUPAC name of the compound `CH₃-CH₂-CH(CH₃)-CH₂-COCl` is **3-methylpentanoyl chloride**.

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