Question

Which of the following is a $4$-carbon compound?

• A. Oxaloacetic acid
• B. Phosphoglyceric acid
• C. Ribulose bis phosphate
• D. Phosphoenol pyruvate

Answer 1

Answer: (A)

Oxaloacetic acid

Answer 2

Oxaloacetic acid is a 4C compound, $H O_2CCH_2 COCO_2H$, that plays an integral role in the Krebs cycle. The anion, oxaloacetate, reacts with the acetyl group, from acetyl coenzyme A to form citrate.