The IUPAC name of CH₃CH₂COCl is:

• (A) Propanoyl chloride
• (B) Ethanoyl chloride
• (C) Acetyl Chloride
• (D) Chloroethane

The compound CH₃CH₂COCl is a type of acyl chloride. To determine its IUPAC name, let’s break it down.

Analyzing the Structure

The structure consists of a three-carbon chain with a carbonyl group (C=O) and a chlorine atom attached to the terminal carbon. This indicates that it is derived from propanoic acid.

Identifying the Correct Name

• Propanoyl chloride: This name refers to the acyl chloride derived from propanoic acid, which matches our compound.
• Ethanoyl chloride: This is derived from acetic acid (two carbons), so it doesn't fit.
• Acetyl Chloride: Another name for ethanoyl chloride, also not applicable here.
• Chloroethane: This is an alkane with two carbons and a chlorine, which is incorrect.

Final Answer

The correct IUPAC name for CH₃CH₂COCl is Propanoyl chloride (Option A).