Basic Unit Processes Questions and Answers on “Materials susceptible to hydrolysis”.
1. The addition of water to acetylene produces what?
a) Acetaldehyde
b) Acetic acid
c) Both acetaldehyde and acetic acid
d) None of the mentioned
Answer: a
Clarification: The addition of water to acetylene produces acetaldehyde.
2. Cellulose is hydrolysed to produce what?
a) Invertase
b) Maltose
c) Glucose
d) All of the mentioned
Answer: c
Clarification: Cellulose is hydrolysed to glucose by acids and to cellobiose by its own specific enzyme cellulase.
3. Starch is hydrolysed into what?
a) Glucose
b) Maltose
c) Both glucose and maltose
d) None of the mentioned
Answer: c
Clarification: Enzymes and dilute acids hydrolyse starch ii1to maltose and glucose, whereas inulin yields only fructose by this treatment.
4. Organic esters hydrolysis with which compound?
a) Acids
b) Base
c) Enzymes
d) All of the mentioned
Answer: d
Clarification: Organic esters of all kinds, including the esters of carbohydrates, are quite subject to hydrolysis with acids, bases, and, in many cases, enzymes.
5. Hydrolysis of esters is irreversible.
a) True
b) False
Answer: b
Clarification: Hydrolysis of esters is reversible, unlike that of the carbohydrates, so that the equilibrium point may be approached from both sides.
6. Which of the following is an esters of inorganic acids?
a) Methyl sulphates
b) Alkyl phosphates
c) Glyceryl nitrate
d) All of the mentioned
Answer: d
Clarification: The esters of inorganic acids, ethyl and methyl sulphates, ethyl hydrogen: sulphate, the alkyl phosphates, glyceryl nitrate, etc., may all be hydrolysed, generally speaking, by acids and bases.
7. Which of the following compounds react readily with water alone?
a) Acid halides
b) Alkyl compounds
c) Aryl compounds
d) All of the mentioned
Answer: a
Clarification: The acid halides, like acetyl chloride, reacting readily with water alone, whereas varying degrees of resistance are shown by the alkyl and aryl compounds.
8. The aromatic halides are much easier to hydrolyse.
a) True
b) False
Answer: b
Clarification: The aromatic halides are much more difficult to hydrolyse, acids on the other hand are easy to hydrolyse.
9. Which nitrogen compound can resist hydrolysis?
a) Aromatic
b) Aliphatic
c) Both aromatic and aliphatic
d) None of the mentioned
Answer: c
Clarification: Aliphatic and aromatic amines-ethylamine and aniline-resist hydrolysis even under extreme conditions, though the production of a-naphthol from a-naphthyl amine under pressure is recorded.
10. Benzene sulfonic acid in presence of what produces sulphuric acid and benzene?
a) Enzyme
b) Steam
c) Acid
d) None of the mentioned
Answer: b
Clarification: Benzene sulfonic acid, when treated with steam under pressure, yields benzene and sulfuric acid.
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