Engineering Questions with Answers - Multiple Choice Questions

Chemical Industry MCQ’s – Synthetic Organic Chemical – Ddt

1 - Question

What are the raw materials needed for the manufacture of DDT (Dichlorodiphenyltrichloroethane)?
a) Ethanol+benzene
b) Methanol+benzene
c) Benzenol+Ethanol
d) Ethanol+Methanol
View Answer Answer: a
Explanation: The raw materials for DDT manufacture are ethanol and benzene. The ethanol can be converted to chloral by oxidation to acetaldehyde followed by chlorination.

2 - Question

How is chloral condensed in the manufacture of DDT?
a) Adding Sulfuric acid
b) Adding hydrochloric acid
c) Adding NaOH
d) Adding phosphoric acid
View Answer Answer: a
Explanation: The chloral or chlorobenzene are condensed using strong sulfuric acid or oleum as catalyst. The reaction takes place at 15°C and reaction time of 5-6 hours.

3 - Question

Iron does not catalyse the decomposition of DDT.
a) True
b) False
View Answer Answer: b
Explanation: Contact of DDT (Dichlorodiphenyltrichloroethane) product with iron must be scrupulously avoided since iron catalyses the decomposition of DDT.

4 - Question

Temperature plays a vital role in the manufacture of DDT.
a) True
b) False
View Answer Answer: a
Explanation: Temperature must be carefully controlled to prevent sulfonation of the monochlorobenzene by the acid catalyst which is excessive at higher temperature. So, temperature plays a major role in manufacture of Dichlorodiphenyltrichloroethane.

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