When pentanoyl chloride (CH3CH2CH2CH2COCl) is treated with a reagent, the products formed will depend on the specific reagent used. Since you did not provide the reagent in your question, I cannot give you the exact product(s) formed. However, I can provide you with a general outline of how to approach this type of problem:
1. Identify the reagent: Determine the reagent that you are using to treat pentanoyl chloride. Common reagents include alcohols, amines, water, and Grignard reagents.
2. Determine the reaction: Based on the reagent, determine the reaction that will take place with pentanoyl chloride. For example:
a. Alcohol: Esterification
b. Amine: Amide formation
c. Water: Hydrolysis
d. Grignard reagent: Ketone formation
3. Draw the product(s): Based on the reaction determined in step 2, draw the structure(s) of the product(s) formed.
Please provide the specific reagent, and I will be happy to help you determine the product(s) formed when pentanoyl chloride is treated with that reagent.