The IUPAC name for isobutyl chloride is :-

Options

A. 2-methyl-2-chloro butane
B. 2-Chloro-2-methyl butane
C. 1-Chloro-2-methyl propane
D. 2-Methyl-3-chloro propane

Answer

To determine the IUPAC name for isobutyl chloride, we can follow these steps:

### Step 1: Identify the structure of isobutyl chloride
Isobutyl chloride has the following structure:
- It consists of a four-carbon chain (butane) with a chlorine atom (Cl) and a methyl group (CH3) attached.

### Step 2: Determine the longest carbon chain
In isobutyl chloride, the longest continuous carbon chain contains three carbon atoms. This is because the structure can be visualized as:
```
CH3
|
CH3-CH-CH2-Cl
```
Here, the longest chain is three carbons long.

### Step 3: Number the carbon chain
Number the carbon chain from the end nearest to the chlorine atom to give the substituents the lowest possible numbers:
1. The carbon with the chlorine (Cl) is numbered as 1.
2. The carbon with the methyl group (CH3) is numbered as 2.

### Step 4: Identify the substituents
- The substituent on carbon 1 is a chlorine atom (Cl).
- The substituent on carbon 2 is a methyl group (CH3).

### Step 5: Write the IUPAC name
According to IUPAC nomenclature:
- The substituents are listed in alphabetical order.
- The name will include the position of the substituents and the name of the main carbon chain.

Thus, the IUPAC name is:
**1-Chloro-2-Methylpropane**

### Final Answer
The IUPAC name for isobutyl chloride is **1-Chloro-2-Methylpropane**.

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