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 Answer: b
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 Answer: b
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 Answer: a
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 Answer: d
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 Answer: a
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 Answer: b
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 Answer: a
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 Answer: c
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.

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