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)?
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
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.
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.
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.