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

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

KEAMKEAM 2010Respiration in Plants

Solution:

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.