The correct name of 1-methoxy-1-ethyl-2-methyl propane is:

Options

A. 2-methyl-3-methoxy pentane
B. 1-methoxy-1-iso-propyl methane
C. 3-methoxy-4-methylpentane
D. 3-methoxy-2-methyl pentane

Answer

To find the correct name of 1-methoxy-1-ethyl-2-methylpropane, we will follow these steps:

### Step 1: Draw the Structure
1. **Identify the components**:
- 1-methoxy indicates a methoxy group (-OCH₃) attached to the first carbon.
- 1-ethyl indicates an ethyl group (-C₂H₅) also attached to the first carbon.
- 2-methyl indicates a methyl group (-CH₃) attached to the second carbon.
- The base name is propane, which indicates a three-carbon chain.

2. **Construct the structure**:
- Start with a propane backbone (3 carbons).
- Add the methoxy and ethyl groups to the first carbon.
- Add the methyl group to the second carbon.

### Step 2: Number the Carbon Chain
1. **Number the carbon atoms**:
- Start numbering from the end closest to the first substituent (in this case, the methoxy and ethyl groups).
- The numbering will be:
- Carbon 1: Methoxy and Ethyl
- Carbon 2: Methyl
- Carbon 3: Part of the propane chain.

### Step 3: Identify the Longest Carbon Chain
1. **Determine the longest continuous carbon chain**:
- In this case, the longest chain is actually 5 carbons long when you consider the ethyl group as part of the chain.
- The correct parent chain is therefore pentane.

### Step 4: Assign the Correct Positions to the Substituents
1. **Reassign the positions based on the longest chain**:
- The methoxy group is now on carbon 3.
- The methyl group is on carbon 2.
- The ethyl group is still on carbon 1.

### Step 5: Write the Correct IUPAC Name
1. **Combine the substituents and the parent chain**:
- The substituents are in alphabetical order:
- Methoxy (3-methoxy)
- Methyl (2-methyl)
- The parent chain is pentane.

Thus, the correct IUPAC name is **3-methoxy-2-methylpentane**.

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