Question

Structure of the compound whose IUPAC name is 3- Ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid is

• A.
• B.
• C.
• D.

Answer 1

The Correct Option is B

The given IUPAC name is 3-Ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid. To determine the structure corresponding to this name, let's break it down step by step:

1. The parent chain is a hexene (hex = 6 carbon atoms, ene = a double bond).
2. The chain also includes a ynoic acid (yne = a triple bond, oic acid = carboxylic acid group).
3. The numbering of the chain begins from the end closest to the carboxylic acid group.
4. The given structure has the following substituents:
   • At position 3: Ethyl group (−C₂H₅)
   • At position 2: Hydroxy group (−OH)
   • At position 4: Methyl group (−CH₃)
5. The double bond is located at position 3, and a triple bond at position 5.

Taking all these components into account, the structure needs to accommodate all these functional groups, substituents on the main hexene chain, and place the carboxylic acid group at one end.

Among the given options, Option B corresponds to the correct structure, which includes all the points mentioned above.

Therefore, the correct structure for the compound 3-Ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid is shown in Option B.