Which of the following is the correct structure for 3-pentanone?

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Question: Which of the following is the correct structure for 3-pentanone?

Options:

Correct Answer: CH3CH2COCH2CH3

Solution:

3-Pentanone has the structure CH3CH2COCH2CH3, with the carbonyl group on the third carbon.

Which of the following is the correct structure for 3-pentanone?

Which of the following is the correct structure for 3-pentanone?

Step 1: Understand that '3-pentanone' is a type of ketone, which means it has a carbonyl group (C=O) in the middle of the carbon chain.
Step 2: Identify that 'pentanone' indicates a 5-carbon chain (since 'pent' means five).
Step 3: The '3-' in '3-pentanone' tells us that the carbonyl group is located on the third carbon of the chain.
Step 4: Draw a straight chain of 5 carbon atoms: C-C-C-C-C.
Step 5: Number the carbon atoms from left to right: 1, 2, 3, 4, 5.
Step 6: Place the carbonyl group (C=O) on the third carbon (C3).
Step 7: Fill in the remaining hydrogen atoms to satisfy the carbon valency (4 bonds).
Step 8: The final structure will be CH3CH2COCH2CH3, showing the carbonyl group on the third carbon.

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