Engineering Questions with Answers - Multiple Choice Questions
Unit Processes MCQ’s – Desulfonation Reactions
1 - Question
Hydrolytically sulfonated is reacted in which medium?
a) Aqueous basic medium
b) Aq. Acidic medium
c) Neutral medium
d) None of the mentioned
View Answer
Explanation: Aromatic sulfonates are hydrolytically desulfonated by heating in aqueous acid medium.
2 - Question
Which type of reaction is the following: RSO3H + HOH ——> RH + H2SO4.
a) Sulfonation
b) Desulfonation
c) Chlorosulfonation
d) Rearrangement
View Answer
Explanation: The following reaction is Desulfonation of Aromatic sulfates.
3 - Question
What effect does Mineral acid has on Desulfonation reaction?
a) Increases reaction rate
b) Decrease reaction rate
c) No effect on it
d) Inhibits the reaction
View Answer
Explanation: Desulfonation reaction, which is the reverse of sulfonation, generally proceeds rapidly and in good yield, especially in the presence of an added mineral.
4 - Question
Which of the following is/are mineral acid?
a) Phosphoric
b) Hydrochloric
c) Hydrobromic
d) All of the mentioned
View Answer
Explanation: Sulfuric, phosphoric, hydrochloric, hydrobromic comes under Mineral acids.
5 - Question
What effect does increased ring methylation has on Sulfonation?
a) Increases
b) Decreases
c) Neutral
d) None of the mentioned
View Answer
Explanation: It is known that increased ring methylation generally lowers the desulfonation temperature for both hydrocarbon and phenolic sulfonates.
6 - Question
Sulfonation, followed by desulfonation method cannot be used for separation of Aromatic compounds.
a) True
b) False
View Answer
Explanation: Sulfonation, followed by desulfonation, has been used to separate mixtures of aromatic compounds not easily separable by distillation. Either or both steps can be selective.
7 - Question
Sulfonation-Desulfonation is useful in preparation of what?
a) Ortho isomer
b) Para isomer
c) Meta isomer
d) None of the mentioned
View Answer
Explanation: Sulfonation-desulfonation is a useful tool for preparing ortho isomer derivatives of benzene.
8 - Question
Why is there a need to use “Brining-out” process?
a) Mixing Sulfonates
b) Increasing reaction
c) Isolating sulfonates
d) All of the mentioned
View Answer
Explanation: The “brining-out” procedure is used commercially to isolate many sulfonate dye intermediates, including those from nitrobenzene, the nitrotoluenes, the nitro chlorobenzenes, naphthalene etc.