Question

Pyruvic acid is obtained by:
A. Oxidation of acetaldehyde cyanohydrin
B. Oxidation of formaldehyde cyanohydrin
C. Oxidation of acetone cyanohydrin
D. None of the above

Answer 1

Pyruvic acid can be produced using glucose through glycolysis, changed over back to sugars, (for example, carbohydrates) by means of gluconeogenesis, or to unsaturated fats through acetyl, It can likewise be utilized to build the amino acid alanine and be changed over into ethanol.

Complete step by step answer:
On the off chance that deficient oxygen is accessible, the acid is separated anaerobically, making lactate in animals and ethanol in plants and microorganisms. Pyruvate from glycolysis is changed over by maturation to lactate utilizing the protein lactate dehydrogenase and the coenzyme NADH in lactate aging. On the other hand it is changed over to acetaldehyde and afterward to ethanol in alcoholic fermentation.
Acetaldehyde with HCN gives acetaldehyde cyanohydrin
$C{{H}_{3}}CHO+HCN\to C{{H}_{3}}CH\left( CN \right)-OH$
on oxidation it gives pyruvic acid,
$C{{H}_{3}}CH\left( CN \right)-OH\to C{{H}_{3}}CH\left( OH \right)-COOH$
$C{{H}_{3}}CH\left( OH \right)-COOH\to C{{H}_{3}}C\left( COOH \right)=O$

**So, the correct option is A. Oxidation of acetaldehyde cyanohydrin.

Additional information: **
Pyruvic acid: A colorless liquid; an important intermediate in the metabolism of proteins and carbohydrates, and in fermentation.
conjugate base: Any compound, of general formula $X{^{n+}}$which can be transformed into a conjugate acid $HX{^{{(n+1)}+}}$ by the gain of a proton.
Krebs cycle: A series of enzymatic reactions that occurs in all aerobic organisms; it involves the oxidative metabolism of acetyl units and serves as the main source of cellular energy.

Note:
Pyruvic acid supplies energy to living cells through the citric acid cycle (otherwise called the Krebs cycle ) when oxygen is available (vigorous breath); it ages to deliver lactic corrosive when oxygen is missing (fermentation ). Pyruvate is the yield of the anaerobic metabolism of glucose known as glycolysis.