Question

What is the IUPAC name of 3–chloropropyl ethyl ether?

• A. 3–Chloro–1–propoxyethane
• B. 3–Chloro–1–ethoxypropane
• C. 1–Chloro–3–propoxyethane
• D. 1–Chloro–3–ethoxypropane

Hint:

In ethers, the longer alkyl group is chosen as the parent chain and the shorter group is named as an alkoxy substituent.

Answer 1

The Correct Option is B

Step 1: Write the structure of the ether.
3–Chloropropyl ethyl ether has the structure: \[ \text{CH}_3\text{CH}_2\text{O–CH}_2\text{CH}_2\text{CH}_2\text{Cl} \] Step 2: Select the parent chain.
The longer carbon chain is propane, so propane is taken as the parent hydrocarbon.
Step 3: Identify substituents and their positions.
An ethoxy group (\(-\text{OC}_2\text{H}_5\)) is attached at carbon 1, and a chloro group (\(-\text{Cl}\)) is attached at carbon 3.
Step 4: Apply IUPAC nomenclature rules.
Substituents are written in alphabetical order with appropriate locants, giving the name: \[ \text{3–Chloro–1–ethoxypropane} \] Step 5: Conclusion.
Hence, the correct IUPAC name is 3–Chloro–1–ethoxypropane.