Unit Processes Multiple Choice Questions on “Liquid Phase Oxidation with Oxidizing Compounds”.
1. The action of oxidizing agents on organic compounds depends what?
a) Temperature
b) Nature of agent
c) Concentration of reactant
d) All of the mentioned
Answer: d
Clarification: The action of oxidizing agents on organic compounds depends not only upon the nature of the agent or the compound but also upon such factors as concentration, temperature, hydrogen-ion concentration, and method of mixing.
2. Hydrogen peroxide oxidizes which type of organic compounds?
a) Saturated
b) Unsaturated
c) Aromatic
d) None of the mentioned
Answer: b
Clarification: Hydrogen peroxide in the presence of catalysts of the oxides of Ru, V, Cr, or Mo also oxidizes organic unsaturated compounds to glycols.
3. Nitrobenzene is which type of potent agent?
a) More
b) Less
c) Both More or Less
d) None of the mentioned
Answer: b
Clarification: Less potent agents, such as nitrobenzene, have consequently been used for the direct oxidation of isoeugenol to vanillin. Nitrobenzene has an advantage over more powerful oxidizing agents, such as the dichromates and permanganates, in the oxidation.
4. Which acid is used for the production of synthetic camphor from turpentine?
a) Nitric acid
b) Sulphuric acid
c) Hydrochloric acid
d) None of the mentioned
Answer: a
Clarification: Nitric acid has been widely used in the production of synthetic camphor from turpentine.
5. Which agent can be used to oxidize aniline to Quinone?
a) NaOH
b) KMnO4
c) H2O
d) CO
Answer: b
Clarification: Sodium or potassium dichromate may be used to oxidize aniline to quinone, but a low temperature and slow addition of the oxidizing agent must be employed in order to restrict the action.
6. Is the reaction Oxidation of aniline with Mn02-H2S04 mixtures possible?
a) Yes
b) No
Answer: a
Clarification: Oxidation of aniline with Mn02-H2S04 mixtures is claimed to give 73 percent yield of quinone.
7. Quinone cannot be readily reduced to hydroquinone.
a) True
b) False
Answer: b
Clarification: Quinone is readily reduced to hydroquinone, and much of the quinone that is manufactured is sold in the form of the hydrogenated product.
8. Hydroquinone can be readily oxidized to quinone by which type of agents?
a) Chlorine
b) Nitric acid
c) Persulfuric acid
d) All of the mentioned
Answer: d
Clarification: Hydroquinone, in turn, is readily oxidized to quinone by such agents as chlorine, nitric acid, persulfuric acid, chromic acid, ferric chloride, and permanganates.
9. Reduction of quinone to hydroquinone is a reversible process.
a) True
b) False
Answer: a
Clarification: The reduction of quinone to hydro quinone and the reoxidation of hydroquinone to quinone are very rapid processes and are strictly reversible. This reaction is one of the rare oxidation and reduction reactions of organic chemistry that are rapid and reversible.
10. Which oxide is used for the oxidation of Toluene?
a) Sodium hydroxide
b) Aluminium oxide
c) Manganese dioxide
d) Hydroxide
Answer: c
Clarification: The use of manganese dioxide for the oxidation of toluene to benzaldehyde and benzoic acid was formerly extensive.