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Arachidonic acid has...

Arachidonic acid has

A

20 carbons excluding carboxyl carbon

B

20 carbons including carboxyl carbon

C

16 carbons excluding carboxyl carbon

D

16 carbons including carboxyl carbon

Text Solution

AI Generated Solution

The correct Answer is:
To determine the number of carbon atoms in arachidonic acid, we can follow these steps: ### Step 1: Understand the Structure of Arachidonic Acid Arachidonic acid is a polyunsaturated fatty acid. It is important to note that it contains a carboxyl group (-COOH) at one end of its carbon chain. ### Step 2: Count the Total Number of Carbon Atoms Arachidonic acid has a total of 20 carbon atoms in its structure. This includes the carbon atom that is part of the carboxyl group. ### Step 3: Differentiate Between Including and Excluding the Carboxyl Carbon - **Including the Carboxyl Carbon**: When we count the carboxyl carbon, we have 20 carbons in total. - **Excluding the Carboxyl Carbon**: If we do not count the carboxyl carbon, we have 19 carbon atoms in the hydrocarbon chain. ### Step 4: Analyze the Options Given 1. **20 carbon excluding carboxyl carbon**: This is incorrect because it does not account for the carboxyl carbon. 2. **20 carbon including carboxyl carbon**: This is correct as it includes the carboxyl carbon. 3. **16 carbon excluding carboxyl carbon**: This is incorrect as it undercounts the number of carbons. 4. **16 carbon including carboxyl carbon**: This is also incorrect for the same reason. ### Conclusion The correct answer is that arachidonic acid has **20 carbon atoms including the carboxyl carbon**. ---
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