250+ TOP MCQs on Synthetic Organic Chemical – Ddt and Answers

Chemical Industry Multiple Choice Questions on “Synthetic Organic Chemical – Ddt”.

1. What are the raw materials needed for the manufacture of DDT (Dichlorodiphenyltrichloroethane)?
a) Ethanol+benzene
b) Methanol+benzene
c) Benzenol+Ethanol
d) Ethanol+Methanol

Answer: a
Clarification: 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. How is chloral condensed in the manufacture of DDT?
a) Adding Sulfuric acid
b) Adding hydrochloric acid
c) Adding NaOH
d) Adding phosphoric acid

Answer: a
Clarification: 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. Iron does not catalyse the decomposition of DDT.
a) True
b) False

Answer: b
Clarification: Contact of DDT (Dichlorodiphenyltrichloroethane) product with iron must be scrupulously avoided since iron catalyses the decomposition of DDT.

4. Temperature plays a vital role in the manufacture of DDT.
a) True
b) False

Answer: a
Clarification: 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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