Which of the following is a straight-chain alkyl carboxylic acid with the chemical formula CH CH CH CO H? 3 2 2 2

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Accepted Answer

Step 1: Write the given formula clearly as $CH_3CH_2CH_2CO_2H$. This is a straight-chain carboxylic acid.

Step 2: Count the carbon atoms: there are 4 carbons total (three in the alkyl chain + one in the carboxyl group), so the parent name uses the prefix "but-" for four carbons.

Step 3: Match with options:
- Methanoic acid = 1 C ($HCO_2H$)
- Ethanoic acid = 2 C ($CH_3CO_2H$)
- Propionic acid = 3 C ($CH_3CH_2CO_2H$)
- Butyric (butanoic) acid = 4 C ($CH_3CH_2CH_2CO_2H$)

Therefore the correct choice is Butyric acid (option 4), which corresponds to answer d.

FINAL_ANSWER: d

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