Which formula represents an organic acid?

HCOOCH3
CH3CH2OH
CH3COCH3
HCOOH

HCOOH

To determine which formula represents an organic acid, we need to understand what an organic acid is. An organic acid is a type of compound that contains a carboxyl group (–COOH) in its structure.

Now let's examine each formula:

1. HCOOCH3: This formula represents methyl formate, which does not contain the carboxyl group. Therefore, it is not an organic acid.

2. CH3CH2OH: This formula represents ethanol, which is not an organic acid. It is an alcohol.

3. CH3COCH3: This formula represents acetone, which does not contain the carboxyl group. Therefore, it is not an organic acid.

4. HCOOH: This formula represents formic acid, which contains the carboxyl group. So, HCOOH is an organic acid.

Therefore, the formula HCOOH represents an organic acid.

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