Question

The functional group —COOH is found in
(1) esters (3) alcohols
(2) aldehydes (4) organic acids

Answer 1

Answer: Option (2) is the correct answer.

Explanation:

When for a particular compound a group of atoms shows certain characteristics reactions then that group is known as functional group.

Functional group of esters is "-COO".

Functional group of alcohols is "-OH".

Functional group of aldehydes is "-COOH".

Organic acids are the compounds that show acidic properties. Like $-SO_{3}H$, -COOH etc.

Thus, we can conclude that the functional group —COOH is found in aldehydes.

Answer 2

Answer:

#2 is the correct answer

Explanation:

because aldehydes are -COOH