Q.Which of the following is a 4-carbon compound ?

A. Oxaloacetic acid

B. Phosphoglyceric acid

C. Ribulose 1,5-diphosphate

D. Phosphoenol pyruvate

Correct Answer : Option : A

Solution

Oxaloacetic acid is a crystalline organic compound with the chemical formula HO₂CCCH₂CO₂H which is used a reactant combine with acetyl coenzyme A and form citric acid in the condensation reaction of Kreb’s cycle.
So the correct option is ‘Oxaloacetic acid’.