Engineering Questions with Answers - Multiple Choice Questions
Unit Processes MCQ’s – Aromatic Nitration
1 - Question
ArH + ____ ——-> ArNO2 + H2O.
a) HNO
b) HNO2
c) HNO3
d) Not needed
View Answer
Explanation: We need to use nitric acid HNO3 to complete the reaction.
2 - Question
The nitrating agent is a ______ reactant.
a) Electrophilic
b) Nucleophilic
c) All of the mentioned
d) None of the mentioned
View Answer
Explanation: The nitrating agent is called electrophile reactant as it is positively charged.
3 - Question
In which position does the nitro group enters?
a) Ortho
b) Para
c) Meta
d) All of the mentioned
View Answer
Explanation: Ortho, para, and meta are the positions on the ring where the Nitro group enters.
4 - Question
The electron density is least at which position?
a) Ortho
b) Para
c) Meta
d) Equal at all places
View Answer
Explanation: The electron density is least at -meta position, as its least favourable position.
5 - Question
Nitration products at ortho and para position predominates?
a) True
b) False
View Answer
Explanation: As electron density is greater at ortho and para positions, the substitution of nitrating compound at ortho and para predominates.
6 - Question
What is alpha and beta position in naphthalene series?
a) 1,4 and 1,8
b) 1,5 and 1,8
c) 1,3 and 1,6
d) All of the mentioned
View Answer
Explanation: Naphthalene series has 2 different mononitro derivatives called alpha and beta know as 1, 5 nitronaphthalene and 1, 8 nitronapthalene.
7 - Question
The inductive effect is not associated with the dipole movement between the molecules C6H5-X?
a) True
b) False
View Answer
Explanation: The inductive effect depends on the electron density which produces a dipole movement between the molecule.
8 - Question
If X is negative in the inductive effect, it draws _____ towards itself.
a) Protons
b) Electrons
c) All of the mentioned
d) None of the mentioned
View Answer
Explanation: The inductive effect is produced due to the movement of electrons as they are lighter. Therefore atoms or molecules having an electron induces negative inductive effect.
9 - Question
-I effect causes _______ to electron?
a) Attraction
b) Repulsion
c) Does not affect
d) None of the mentioned
View Answer
Explanation: Inductive effect causes movement of electron -I effect attracts electron towards the molecule(X).
10 - Question
If X is the positive end of dipole, it will cause which effect?
a) -I effect
b) +I effect
c) Causes both
d) -M effect
View Answer
Explanation: As X is the positive end, it will increase the electron density on the ring and hence produces +I effect.
11 - Question
In -I effect, which position is most active?
a) Ortho
b) Para
c) Meta
d) All are equally active
View Answer
Explanation: -I effect reduces the reactivity of all the positions in the ring, and the effect being greater at ortho and para positions, hence meta is more active.
12 - Question
“-NO2” produces which effect?
a) Both the effects
b) Does not produce any
c) +I effect
d) -I
View Answer
Explanation:-NO2 is an example of -I effect as it causes reduction in reactivity.