Unit Processes Mcqs on “Vapor Phase Oxidation of Aliphatic Compounds”.
1. For vapour phase oxidation low pressure is required.
a) True
b) False
Answer: b
Clarification: The vapour phase oxidation must have sufficiently high vapour pressures at the temperatures required for oxidation to make it possible to mix them with air (oxygen) and pass them in the gaseous state over the catalyst material.
2. Methanol decomposes to form hydrogen and which is the other product?
a) Carbon monoxide
b) Carbon dioxide
c) Carbon
d) None of the mentioned
Answer: a
Clarification: During oxidation of methanol by vapour phase oxidation, is give carbon monoxide and hydrogen as products.
3. Which type of reaction is oxidation of methanol?
a) Exothermic
b) Endothermic
c) Neutral
d) None of the mentioned
Answer: b
Clarification: Oxidation of methanol reaction is endothermic, and heat must be supplied.
4. Ethanol is oxidized to produce what?
a) Phenol
b) Alcohol
c) Carboxylic acid
d) Acetaldehyde
Answer: d
Clarification: Ethanol may be dehydrogenated or oxidized to acetaldehyde in the vapour phase with good yields.
5. The direct oxidation of ethanol to acetic acid in a continuous catalytic vapour-phase process is more difficult.
a) True
b) False
Answer: a
Clarification: The direct oxidation of ethanol to acetic acid in a continuous catalytic vapour-phase process is more difficult since losses to formaldehyde, carbon oxides, etc., occur.
6. Catalytic dehydrogenation of methyl vinyl carbinol produces what?
a) Methyl ketone
b) Methyl vinyl aldehyde
c) Ethyl vinyl ketone
d) Methyl vinyl ketone
Answer: d
Clarification: Catalytic dehydrogenation of methyl vinyl carbinol at temperatures above 250°C in presence of a brass spelter catalyst is claimed to give a 33 per cent yield of methyl vinyl ketone, CH3-CO-CH=CH2.
7. Catalytic vapour-phase oxidation of the unsaturated alcohols produces which type of yield?
a) High
b) Low
c) Moderate
d) None of the mentioned
Answer: a
Clarification: Catalytic vapour-phase oxidation of the unsaturated alcohols to form unsaturated carbonyl compounds has been found to give considerably higher yields.
8. The higher-molecular-weight aliphatic hydrocarbons, oxidizing ______ readily. Fill in the blank.
a) More
b) Less
c) Moderately
d) None of the mentioned
Answer: a
Clarification: The higher-molecular-weight aliphatic hydrocarbons, oxidizing more readily under less stringent conditions, may be converted to relatively long chain acids.
9. With such relatively mild catalysts as copper oxide and glass surfaces, some high yields of formaldehyde have been obtained.
a) True
b) False
Answer: a
Clarification: With such relatively mild catalysts as copper oxide and glass surfaces, some high yields of formaldehyde have been obtained from methane and ethane under experimental conditions.
10. Oxidation of natural gas produce what?
a) Formaldehyde
b) Acetaldehyde
c) Methanol
d) All of the mentioned
Answer: d
Clarification: Oxidation of natural gas with very low oxygen concentrations under slight pressure and in the presence of a catalyst, such as copper-copper oxide, has been shown capable of producing a useful mixture of oxygenated products, i.e., formaldehyde, acetaldehyde, and methanol.
11. What happens to aliphatic hydrocarbons when C-atom in straight chain increases?
a) Decreases
b) Increases
c) No change
d) None of the mentioned