The `IUPAC` name of `CH_(3)OC_(2)H_(5)` is

Options

A. (1) methyl ethyl ether
B. (2) ethyl methyl ether
C. (3) methoxyethane
D. (4) ethoxyethane

Explanation

To determine the IUPAC name of the compound \( CH_3OC_2H_5 \), we can follow these steps:

### Step 1: Identify the Structure
The given molecular formula can be broken down into two parts:
- \( CH_3O \) represents a methoxy group (\( -OCH_3 \)).
- \( C_2H_5 \) represents an ethyl group (\( -C_2H_5 \)).

### Step 2: Determine the Parent Chain
In this case, the longest carbon chain is the ethyl group which consists of 2 carbon atoms. Therefore, the parent chain is ethane.

### Step 3: Identify the Functional Group
The methoxy group (\( -OCH_3 \)) is an ether functional group. In this compound, it is attached to the ethyl group.

### Step 4: Naming the Compound
According to IUPAC nomenclature:
- The methoxy group is considered a substituent.
- The name of the substituent (methoxy) is placed before the name of the parent chain (ethane).

Thus, the complete IUPAC name of the compound \( CH_3OC_2H_5 \) is **methoxyethane**.

### Final Answer:
The IUPAC name of \( CH_3OC_2H_5 \) is **methoxyethane**.

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