Which product is made up of fatty acids that are derived from $\mathrm{alkenes}$?

• A. Soap
• B. Sucrose
• C. Polyethylene
• D. Cellulose

Answer: (A)

Verified step by step guidance

1. Understand the nature of fatty acids: Fatty acids are long hydrocarbon chains with a carboxylic acid group at one end. They are typically derived from alkenes through chemical reactions such as hydrogenation or oxidation.
2. Identify the products listed and their origins: Soap is made from fatty acids, which come from natural oils and fats containing alkenes (unsaturated hydrocarbons). Sucrose is a sugar, cellulose is a polysaccharide made of glucose units, and polyethylene is a polymer made from ethylene monomers but not related to fatty acids.
3. Recall the process of soap formation: Soap is produced by saponification, which involves the hydrolysis of triglycerides (esters of glycerol and fatty acids) to release fatty acids that are then neutralized to form soap.
4. Connect fatty acids to alkenes: The fatty acids in soap often contain double bonds (alkenes) in their hydrocarbon chains, which are characteristic of unsaturated fats.
5. Conclude that among the options, soap is the product made up of fatty acids derived from alkenes, as it directly involves fatty acids with alkene-derived hydrocarbon chains.