Unit Processes Multiple Choice Questions on “Types of Oxidative Reactions”.
1. Dehydrogenation is not an oxidative reaction.
a) True
b) False
Answer: b
Clarification: Dehydrogenation is an oxidative reaction as Oxygen is added to the compound and hydrogen is removed.
2. Preparation of aldehydes from alcohols is done in which reaction?
a) Addition of O2
b) Replacement reaction
c) Dehydrogenation reaction
d) All of the mentioned
Answer: c
Clarification: Dehydrogenation is a primary method to convert alcohols to aldehydes.
3. Complete the following reaction: CH3CH0 + 0.5 O2 —–>______.
a) CH4
b) CH3CHO
c) CH3COOH
d) None of the mentioned
Answer: c
Clarification: In this reaction an atom of oxygen may be introduced into a molecule, such as: CH3CH0 + 0.5 O2 —–> CH3COOH.
4. Is a combination of dehydrogenation and introduction of oxygen possible?
a) Yes
b) No
Answer: a
Clarification: A combination of dehydrogenation and introduction of oxygen is done as in the preparation of aldehydes from hydrocarbons: CH4 + O2 ——> CH2O + H20.
5. Which of the following is an oxidizing agent?
a) KMnO4
b) NaOH
c) CO
d) All of the mentioned
Answer: d
Clarification: All of the following acts as catalyst or can be used directly for oxidization.
6. Oleic acid can be converted to dihydroxystearic acid in presence of what?
a) NaOH
b) KMnO4
c) H2O
d) CO
Answer: b
Clarification: Oleic acid can be converted to dihydroxystearic acid in presence of alkaline potassium permanganate (KMnO4).
7. Conversion of Benzoyl Chloride to Benzoyl Peroxide is called which oxidative reaction?
a) Dehydrogenation
b) Direct O2 addition
c) Peroxidation
d) Combine oxidation
Answer: c
Clarification: In peroxidation, require the interaction of an inorganic peroxide, therefore converting Benzoyl Chloride to Benzoyl Peroxide.
8. Amino compounds may be oxidized to which compound(s)?
a) Azobenzene
b) Para-amino-phenol
c) Nitrobenzene
d) All of the mentioned
Answer: d
Clarification: Amino compounds may be oxidized to azobenzene, p-amino-phenol, or nitrobenzene under moderate conditions, or the N-containing radical may be completely removed under drastic conditions.
9. Sulphur compounds may be oxidized by which acid?
a) Permanganate
b) Hydroxide
c) Oxygen
d) All of the mentioned
Answer: a
Clarification: Sulphur compounds may be oxidized by acid permanganate, as in the preparation of sulfonals, trionals, and tetranals.
10. Oxidation of aldehydes give what?
a) Alcohols
b) Carboxylic acid
c) Amide
d) Peroxide
Answer: b
Clarification: As oxidation of alcohols gives aldehyde, similarly oxidation of aldehyde gives carboxylic acid.