This set of Chemical Technology Multiple Choice Questions & Answers (MCQs) focuses on “Synthetic Organic Chemical Industries – C3 Compounds”.
1. Which of the following is the simplest example of secondary alcohol?
a) Isopropanol
b) Butanol
c) Acetone
d) Acetonitrile
View Answer
Explanation: Out of the options provided, isopropanol is the simplest example of a secondary alcohol. Isopropanol is also known as isopropyl alcohol. The chemical formula of isopropanol is (CH3)2CHOH. Isopropyl alcohol is miscible in glycerin, ether, benzene, etc.
2. In which of the following is isopropyl alcohol insoluble in?
a) Water
b) Alcohol
c) Salt solutions
d) Chloroform
View Answer
Explanation: Isopropanol is soluble in water, alcohol, ether, and chloroform. Isopropyl alcohol or isopropanol is insoluble in salt solutions. This is because isopropyl alcohol is a polar solvent but it just isn’t polar enough to overcome the ionic bonds holding the salt together.
3. Which of the following is not an application of isopropanol?
a) Intermediate for acetone
b) Good solvent for plastics
c) Industrial solvent
d) Drying agent
View Answer
Explanation: Isopropanol has many applications including its usage as an intermediate for acetone, as an industrial solvent and a drying agent. Acetone is a good solvent for plastics, not isopropanol. Therefore, that is not an application of isopropanol.
4. The process of isopropanol production is highly exothermic.
a) True
b) False
View Answer
Explanation: Isopropanol is produced by the process of Hydration of Propylene via Sulfation and Hydrolysis. The primary reaction is a gas-liquid reaction in which propylene is absorbed into a tray tower fed with sulphuric acid. This reaction takes place at room temperature and is highly exothermic.
5. Why is refrigerated brine used in the production of isopropyl alcohol?
a) To cool the final product
b) To cool the sulphuric acid
c) To control the temperature in the absorber
d) To control the temperature in the stripper
View Answer
Explanation: The production of isopropyl alcohol taking place in the absorption reactor is highly exothermic. So, refrigerated brine is used to control the temperature in the absorber. The jacketed arrangement will be preferred for the tray absorption column to circulate the refrigerated brine in the cooling jacket.
6. Which of the following is involved in the production of bisphenol?
a) Isopropanol
b) Acetonitrile
c) Butanol
d) Acetone
View Answer
Explanation: Acetone is mainly used as a solvent and also used in the production of methyl methacrylate and bisphenol. Bisphenol A is produced by the condensation of phenol and acetone in the presence of an acid catalyst and usually a promoter such as a methyl mercaptan.
7. What is the percentage of isopropanol used in acetone production?
a) 90%
b) 88%
c) 85%
d) 72%
View Answer
Explanation: The percentage of isopropanol required for the production of 1 ton of acetone is 88 percentage. This method of acetone production is known as Catalytic dehydrogenation of Isopropanol. On catalytic dehydrogenation isopropanol, secondary alcohol will produce acetone, a ketone.
8. A scrubber and a stripper are the same.
a) True
b) False
View Answer
Explanation: No, they are not the same. A stripper removes the absorbed solute from the solvent, whereas scrubber systems are used to remove some particulates or gases from industrial exhaust streams.
9. In which of the following is acetonitrile soluble?
a) Pentane
b) Petroleum
c) Ether
d) Water
View Answer
Explanation: Acetonitrile is very soluble in water. It mixes with most of the organic solvents also such as alcohols, esters, acetone, ether, benzene, chloroform, carbon tetrachloride, and many other unsaturated hydrocarbons. Acetonitrile is not soluble in the other components mentioned.
10. Identify the catalyst used for the production of acetonitrile via the Propylene-Ammonia-Air Oxidation process.
a) Ziegler catalyst
b) Zinc oxide
c) Mo-Bi catalyst
d) Vanadium pentoxide
View Answer
Explanation: The catalyst used for the production of acetonitrile via the Propylene-Ammonia-Air Oxidation process is Bismuth-Molybdate catalyst (Bi-Mo catalyst). Cyclone separator is also kept in the fluidized bed reactor in which catalyst and product gases are separated after fluidization.
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