The IUPAC name of ethyl isobutyl ether is

Options

A. 1 - ethoxy propane
B. 1 - ethoxy - 2- methyl propane
C. 1 - ethoxy butane
D. 2 - methyoxy butane

Answer

To determine the IUPAC name of ethyl isobutyl ether, we can follow these steps:

### Step 1: Understand the Components of the Ether
Ethyl isobutyl ether consists of two groups:
- Ethyl group (C2H5 or CH2CH3)
- Isobutyl group (C4H9 or (CH3)2CHCH2)

### Step 2: Draw the Structure
1. The ethyl group is attached to one side of the oxygen atom.
2. The isobutyl group is attached to the other side of the oxygen atom.

The structure can be represented as:
```
CH2CH3
|
O
|
(CH3)2CHCH2
```

### Step 3: Identify the Longest Carbon Chain
- The longest carbon chain in the isobutyl group is a 3-carbon chain (propane) with a methyl group attached to the second carbon.

### Step 4: Assign the IUPAC Name
1. The ethyl group is named as "ethoxy" because it is attached to the oxygen.
2. The isobutyl group contributes to the main chain, which is propane.
3. The methyl group is on the second carbon of the propane chain.

Thus, the IUPAC name can be constructed as:
- "1-ethoxy" (indicating the ethyl group)
- "2-methyl" (indicating the methyl group on the propane)
- "propane" (the main chain)

### Final IUPAC Name
The complete IUPAC name is **1-ethoxy-2-methylpropane**.