Engineering Questions with Answers - Multiple Choice Questions
Unit Processes MCQ’s – Aminating Agents-Hydroammonolysis
1 - Question
The reactions involving the lower aliphatic aldehydes takes place in what phase?
a) Vapour
b) Liquid
c) Solid
d) All of the mentioned
View Answer
Explanation: The reactions involving the lower aliphatic aldehydes usually take place in the vapor phase.
2 - Question
We get better results of hydroammonolysis in the presence of which solvent?
a) Zinc
b) Alcohol
c) Water
d) Ammonia
View Answer
Explanation: In liquid-phase reactions, better results are generally obtained if hydro ammonolysis is carried out under pressure in the presence of an alcohol as a diluent or solvent
3 - Question
In presence of which catalyst do we get nitriles from aldehydes?
a) Zn-Al
b) Cu-Al
c) Cu-Zn
d) All of the mentioned
View Answer
Explanation: Nitriles can be obtained by the ammonolysis of aldehydes in the presence of Cu-Zn catalyst and around 300-350’C and also that cobalt or copper and zinc are specific catalysts for the preparation of nitriles by reacting aldehydes and ammonia.
4 - Question
The treatment of which of the following compound is affected in liquid phase?
a) Aldehydes
b) Aldose
c) Sugars
d) All of the mentioned
View Answer
Explanation: The treatment of the high-boiling aldehydes, aldose sugars, or ketones is generally effected in the liquid phase.
5 - Question
Which type of Aldehyde is acrolein?
a) Saturated
b) Unsaturated
c) Aromatic
d) None of the mentioned
View Answer
Explanation: When unsaturated aliphatic aldehydes such as acrolein are treated, saturation as well as hydroamination occurs, and a normal primary amine is obtained.
6 - Question
Hydroammolysis of ketone are carried out in Liquid phase only.
a) True
b) False
View Answer
Explanation: The hydroammonolysis of ketones to amines can be carried out in either the vapor or the liquid phase.
7 - Question
For highly reactive compounds, which type of reacting is preferred?
a) Hydrogenation
b) Dehydrogenation
c) Addition
d) Substitution
View Answer
Explanation: The formation of amines by addition reactions is confined to highly reactive compounds.
8 - Question
The primary addition compounds are quit unstable.
a) True
b) False
View Answer
Explanation: The primary addition compound is so unstable or reactive that secondary reactions occur before a stable amine is obtained.
9 - Question
By the reaction of NH3 and CO2, what product do we get ?
a) Ammonium carbamate
b) Ammonium carbonate
c) All of the mentioned
d) None of the mentioned
View Answer
Explanation: By reaction of ammonia and carbon dioxide we get ammonium carbamate which is used to make urea.
10 - Question
What acts as a limiting factor in production of urea?
a) Hydrogen
b) Water
c) Carbon
d) Nickel
View Answer
Explanation: The transformation of ammonium carbamate to urea is not a direct dehydration, the presence of water is, however, a limiting factor with respect to the extent that the reaction occurs.
11 - Question
What product do we get when NH3 and CS2 are reacted?
a) Thiocarbamic acids
b) Dithiocarbamic acids
c) Trithiocarbamic acids
d) None of the mentioned
View Answer
Explanation: The addition of ammonia or alkylamines to CS2 to form the amine salts of dithiocarbamic acids.
12 - Question
Ammonia is added to cyanamide to produce what?
a) guanidine
b) Buanidine
c) Aniline
d) Amide
View Answer
Explanation: Ammonia adds to cyanamide to form guanidine. It is presumed that addition occurs at the (-CN) group with the formation of the amidine.