250+ TOP MCQs on Sulfoxidation and Answers

Unit Processes Multiple Choice Questions on “Sulfoxidation”.

1. In Sulfoxidation with SO₂ and O₂, what is also added?
a) Acetic anhydride
b) Acetic acid
c) Phenol
d) None of the mentioned
Answer: a
Clarification: Sulfoxidation, this reaction is chemically quite similar to sulfochlorination, except that acetic anhydride is added.

2. Aldehyde reacts with bisulfide to produce what?
a) 1-hydroxyalkylsulfonates
b) 2-hydroxyalkylsulfonates
c) 3-hydroxyalkylsulfonates
d) All of the mentioned
Answer: a
Clarification: Aliphatic Compounds; Aldehydes and Epoxides. These compounds react easily with bisulfite to yield 1-hydroxy- and 2-hydroxyalkylsulfonates, respectively.

3. Bisulfides cannot react with unsaturated compounds like alkenes.
a) True
b) False
Answer: b
Clarification: Unsaturated Compounds. Alkenes in the presence of general reaction.

3. What is manufactured from Lignin Sulfonates?
a) Detergents
b) Paper pulp
c) Soaps
d) All of the mentioned
Answer: b
Clarification: water-soluble lignin sulfonates are produced annually as a by-product of the manufacture of paper pulp by heating wood under pressure with an aqueous solution of metallic bisulfite and sulphur dioxide.

4. Which compound undergoes oxidation when SO₂ is used?
a) Organic compounds
b) Inorganic compounds
c) Both organic and inorganic compound
d) None of the mentioned
Answer: a
Clarification: When SO₂ and SO₃ is compared, during usage of SO₂, it is the organic rather than the inorganic compound which undergoes the oxidation.

5. Oxidation of SO₂ gives us what?
a) H₂SO₄
b) H₂S₄O₇
c) SO₃
d) HSO₃
Answer: c
Clarification: When SO₂ is oxidised we get SO₃. The reaction is as follows: SO₂ + O —–> SO₃.

6. There are two major steps involved in sulfonating with a compound of SO₃.
a) True
b) False
Answer: a
Clarification: Since SO₃ is made by the oxidation of SO₂, it can be said that, if SO₂ is taken as the starting point, two major steps are involved in sulfonating with a compound of 803 : (1) an oxidation step and (2) the sulfonation step proper.

7. Complete the following reaction: CH₂=CH-C₆H₅ + SO₃( dioxane) ——–> ________
a) HOSCH=CHC₆H₅
b) HOSOCH=CHC₆H₅
c) OH₂SCH=CHC₆H₅
d) HO₃SCH=CHC₆H₅
Answer: d
Clarification: Use of SO₃-dioxane with the alkene (oxidation of both SO₂ and the organic compound before sulfonation), the reaction is as follows : CH₂=CH-C₆H₅ + SO₃( dioxane) ——–> HO₃SCH=CHC₆H₅.

8. Sodium hydroxymethanesulfonates is used as which sulfonating agent?
a) Sulfoalkylation
b) Sulfomethylation
c) Sulfochlorination
d) None of the mentioned
Answer: b
Clarification: Sulfomethylation, here Sodium hydroxymethanesulfonates (“aldehyde bisulfite”) are used to sulfomethylate on reactive carbon atoms (e.g., in phenols or ketones) or on nitrogen (i.e., amines, amides, or sulfoamides).

9. Which of the following is an important industrial wetting agents?
a) Sulfochlorination
b) Sulfoethylation
c) Sulfomethylation
d) None of the mentioned
Answer: b
Clarification: Sulfoethylation is an important industrial wetting agents are prepared by reacting long-chain fatty acid chlorides with salts of 2-hydroxyethanesulfonic acid, HOCH₂CH₂SO₃Na, or N-methyltaurine, CH₃NHCH₂CH₂SO₃Na.

10. Which of the following is not used as a Sulfonating agent?
a) 2-hydroxy-3-chloropropanesulfonate-1
b) CICH₂CHOHCH₂SO₃Na
c) N-methyltaurine
d) None of the mentioned