Question

Q.25 :-Identify the option when the rate of aerobic oxidation reduced in the sewage
that is reduced to the water?
When oxygen concentration falls below 1.5 mg/l
When oxygen concentration falls below 2.5 mg/l
When oxygen concentration falls below 3.5 mg/l
When oxygen concentration falls below 4,5 mg/l
None of these​

Answer 1

Explanation:

when oxygen concentration falls below 1.5 mg/l

Answer 2

Answer:

(a) When oxygen concentration falls below 1.5 mg/l

Explanation:

• When the oxygen concentration drops below 1.5 mg/l, the rate of aerobic oxidation slows and is replaced by anaerobic bacteria, which can oxidize organic molecules without using oxygen.
• Aerobic oxidation of -hydroxy ketones in ethanol catalyzed by dichloro-ethoxy oxovanadium results in the formation of diesters or diketones via carbon-carbon bond cleavage.
• Disecondary glycols do not react in this reaction because it is very chemoselective.
• Ditertiary glycols, on the other hand, successfully react with dichloro-ethoxy oxovanadium or trichloro-oxovanadium to produce the corresponding ketones.
• Aerobic oxidation of -hydroxy ketones in aprotic solvents catalyzed by dichloro-ethoxy oxovanadium or trichloro-oxovanadium yields practically quantitatively the corresponding -diketones.
• When tertiary cyclopropanol molecules react with vanadyl acetylacetonate in an oxygen environment, the cyclopropane moiety fragments, yielding -hydroxy ketones and -diketones.

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