Question

Which of the following acids are dicarboxylic acid?
A.Succinic acid
B.Glutaric acid
C.Lactic acid
D.Cinnamic acid

Answer 1

The lactic acids have only 1 carboxylic acid and cinnamic acid too. One of the acids is naturally produced in the body. The other di carboxylic acid is a linear acid with 4 carbons in its chain.

Complete step by step solution:
Carboxylic acids are the $- {\text{COOH}}$ functional group in organic compounds. Some examples of compounds with carboxylic acid as main functional group- formic acid or merhanoic acid,oxalic acid or Ethanedioic acid, benzoic acid or benzene carboxylic acid etc. Carboxylic acids are weak acids which are partially ionized in aqueous medium.
The organic compound having two carboxylic acids functional groups in them is known as dicarboxylic acid. Succinic acid is a famous example of dicarboxylic acid. Succinic acid's chemical formula is: ${\left( {C{H_2}} \right)_2}{\left( {C{O_2}H} \right)_2}$ . During aerobic respiration, succinic acid is formed in the kreb cycle or TCA cycle in the mitochondria of the cell.
Glutaric acid is another famous example of dicarboxylic acid organic compound. It is pent-1,5-dioic acid. The metabolism of amino acids like lysine and tryptophan produces glutaric acid. When applied to skin or eyes, glutaric acid can cause irritation.
Lactic acid only has one carboxylic acid in them which is present adjacent to the hydroxyl group. It is 2-Hydroxypropanoic acid. Its conjugate is lactate. Lactic acid is present in rich amounts in curd. And it is used as a synthetic intermediate in many organic synthetic industries and in many various biochemical processes.
Cinnamic acid is also having only one carboxylic acid in it. It is ${C_6}{H_5} = CHCOOH$. It is white colored , crystalline organic compound. It is readily soluble in organic solvents like alcohol. It is naturally occurring in plants.

Thus, the correct options are A and B.

Note:
Organic compounds like oxalic acid or Ethanedioic acid are also dicarboxylic organic compounds and Phallic acid or Benzene-1,2-dicarboxylic acid is also an important dicarboxylic organic compound.