This set of Unit Processes Multiple Choice Questions & Answers (MCQs) focuses on “Aminating Agents”.
1. On what quantity does the ammonolysis of halogen and hydroxy compounds depends?
a) Specific reactants
b) Reactivity of amine
c) NH3 ratio
d) All of the mentioned
View Answer
Explanation: Secondary and tertiary amines are almost always formed during the ammonolysis of halogen and hydroxy compounds, the quantity depending on the specific reactants, the reactivity of the amine, the NH3 ratio, and other conditions employed.
2. The Solubility of ammonia in water is influenced by what?
a) Temperature
b) Pressure
c) Temperature & Pressure
d) None of the mentioned
View Answer
Explanation: Aqueous ammonia might be employed under a variety of conditions, since the solubility of ammonia in water is influenced by both temperature and pressure.
3. The presence of water or other solvent is important in ammonolytic reactions.
a) True
b) False
View Answer
Explanation: The presence of water or other solvent must, play an important role in ammonolytic reactions above the critical temperature (131°C) of ammonia.
4. For what percent does NH3 is negatively absorbed in dilute solutions?
a) Upto 25%
b) Upto 50%
c) Upto 75%
d) Upto 100%
View Answer
Explanation: NH3 is negatively absorbed in dilute solutions (i.e., up to 50 per cent).
5. When comparing NH3 and H2O vapour, as P(NH3)/P(H2O) increases, what happens to the NH3 concentration ?
a) Increases
b) Decreases
c) No change
d) None of the mentioned
View Answer
Explanation: with increasing NH concentration, there is a comparative acceleration in the quotient P(NH3)/P(H2O).
6. For the highest conversion to primary amines during ammonolysis, what temperature is desired ?
a) Highest
b) Lowest
c) Moderate
d) No effect
View Answer
Explanation: In order to obtain the highest conversion to primary amines during ammonolysis, it is advisable to employ the lowest possible temperature that produces the necessary energy-intensity factor.
7. Organic compounds are soluble in liquid ammonia.
a) True
b) False
View Answer
Explanation: Ammonia Dissolved in an Inert Solvent. Organic compounds are soluble in liquid ammonia to some extent and, conversely, gaseous NH3 is soluble in some organic liquids.
8. The solubility of NH3 in organic solvents is ______ than it is in water. Fill in the blank.
a) More
b) Less
c) Equal
d) None of the mentioned
View Answer
Explanation: The solubility of NH3 in organic solvents is less than it is in water.
9. Why is Br preferred over Cl during conversion of Halogen compounds?
a) High purity products
b) Faster reaction
c) More energy required
d) All of the mentioned
View Answer
Explanation: the chlorine derivatives are ordinarily employed, but bromine-substituted compounds are sometimes used because they usually lead to the formation of primary amines of higher purity under milder operating conditions.
10. In presence of what do we get Aniline from Chlorobenzene?
a) NH3, Al
b) NH3, H2O
c) NH3, Cu+
d) NH3, Zn+
View Answer
Explanation: We convert Chlorobenzene to Aniline in presence of NH3, Zn+ as reducing agent.
Sanfoundry Global Education & Learning Series – Unit Processes.
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