Hcooh is: formaldehyde formic acid acetone carbon hydroxide

Option (b) is the correct answer.

Explanation:

A functional group that contains "-COOH" is known as a carboxylic acid. Therefore, a compound which contains carboxylic acid will have suffix "-ic" as the identity of the functional group present in it.

Formaldehyde: It has an aldehyde (CHO) group as the functional group.

Formic acid: It has a carboxylic (COOH) group as the functional group.

Acetone: It has ketone (C=O) as the functional group.

Carbon Hydroxide: A compound that contains carbon and hydroxide (OH) group as the functional group is known as alcohol.

Thus, we can conclude that HCOOH is formic acid.

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