The IUPAC name of `C_2H_5OC_3H_7` is

Options

A. Ethoxy propane
B. Ethoxyethane
C. Propoxyethane
D. Methoxy propane

Explanation

To determine the IUPAC name of the compound `C2H5OC3H7`, follow these steps:

### Step 1: Identify the Structure
The compound consists of two alkyl groups connected by an oxygen atom, indicating that it is an ether. The two alkyl groups are `C2H5` (ethyl group) and `C3H7` (propyl group).

**Hint:** Look for the presence of an oxygen atom connecting two carbon chains to identify ethers.

### Step 2: Determine the Alkyl Groups
- The first alkyl group `C2H5` corresponds to the ethyl group.
- The second alkyl group `C3H7` corresponds to the propyl group.

**Hint:** Count the number of carbon atoms in each alkyl group to identify them correctly.

### Step 3: Identify the Parent Chain
In naming ethers, the longer carbon chain is considered the parent chain. Here, the propyl group (C3H7) is longer than the ethyl group (C2H5).

**Hint:** Compare the number of carbon atoms in each alkyl group to determine which is the parent chain.

### Step 4: Name the Parent Chain
The longer carbon chain (propyl) has three carbon atoms, which corresponds to the name "propane". Since it is an alkane, the suffix will be "ane".

**Hint:** Use the number of carbon atoms in the longest chain to derive the base name.

### Step 5: Name the Alkoxy Group
The shorter alkyl group (ethyl) when attached to the oxygen becomes "ethoxy".

**Hint:** Remove the "yl" from the alkyl name and add "oxy" to form the alkoxy name.

### Step 6: Combine the Names
The IUPAC name of the ether is formed by placing the alkoxy name before the parent chain name. Therefore, the complete name is "ethoxy propane".

**Hint:** Remember the order: alkoxy name comes first, followed by the parent chain name.

### Final Answer
The IUPAC name of `C2H5OC3H7` is **ethoxy propane**.

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