This set of Chemical Technology Questions and Answers focuses on “Synthetic Organic Chemical Industries – C2 Compounds”.
1. Ethylene can be obtained from ____________________
a) Calcium carbide
b) Partial oxidation of petroleum fractions
c) Hydrogen steam cracking
d) Thermal pyrolysis of ethane
View Answer
Explanation: Thermal pyrolysis of ethane is not a feasible method for producing ethylene. Acetylene can be obtained from calcium carbide and partial oxidation of petroleum fractions. Hydrogen steam cracking produces both ethylene and acetylene.
2. Which of the following statements are true?
a) Ethylene is highly soluble in water
b) Glycol is used in paint emulsions
c) Aromatics are not produced during steam cracking of hydrocarbons
d) Acetylene is more acidic than ethylene
View Answer
Explanation: Ethylene is slightly soluble in water. Glycol is used as antifreeze but not in paint emulsions. Some of the aromatics are produced as by-products in the steam cracking of hydrocarbons. Acetylene is more acidic than ethylene due to strong overlapping between s and p orbital’s.
3. Which distillation technique is used to separate butane, butylenes, and butadiene?
a) Fractional distillation
b) Vacuum distillation
c) Extractive distillation
d) Steam distillation
View Answer
Explanation: Extractive distillation is used when there is small difference between their boiling points. As butane, butylenes, and butadiene have close boiling points under pressure, they are separated using extractive distillation.
4. Catalyst used in the preparation of ethanol is _________________
a) Phosphoric acid
b) Sulfuric acid
c) Hydrochloric acid
d) Nitric acid
View Answer
Explanation: Synthetic ethanol is prepared by hydration of ethylene with phosphoric acid on celite catalyst.82% of ethanol produced is however manufactured using corn fermentation.
5. Catalyst used in manufacture of ethylene dichloride from ethylene and chlorine is __________
a) Hydrochloric acid
b) Ferric chloride
c) Propylene chloride
d) Poly chloroethane’s
View Answer
Explanation: Catalyst used in manufacture of ethylene dichloride from ethylene and chlorine is traces of ferric chloride or ethylene dibromide. These catalysts give 90-95% yield.
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