Q. Which of the following is a strong -M group?
-
A.
-OCH3
-
B.
-NO2
-
C.
-CH3
-
D.
-F
Solution
-NO2 is a strong -M group as it withdraws electron density through resonance.
Correct Answer: B — -NO2
Learn More →
Q. Which of the following is an example of a -I effect?
-
A.
–F
-
B.
–OCH3
-
C.
–CH3
-
D.
–C2H5
Solution
The –F group is an example of a -I effect as it withdraws electron density through sigma bonds.
Correct Answer: A — –F
Learn More →
Q. Which of the following is an example of a -I group?
-
A.
–F
-
B.
–Cl
-
C.
–Br
-
D.
–I
Solution
All halogens (-F, -Cl, -Br, -I) exhibit -I effect, but -F is the strongest among them.
Correct Answer: A — –F
Learn More →
Q. Which of the following is an example of a -M effect?
-
A.
–NO2
-
B.
–CH3
-
C.
–OCH3
-
D.
–Cl
Solution
The –NO2 group withdraws electron density through resonance, exhibiting a -M effect.
Correct Answer: A — –NO2
Learn More →
Q. Which of the following is NOT a characteristic of the inductive effect?
-
A.
Permanent
-
B.
Distance-dependent
-
C.
Reversible
-
D.
Weakens with distance
Solution
The inductive effect is permanent and weakens with distance, but it is not reversible.
Correct Answer: C — Reversible
Learn More →
Q. Which of the following statements about inductive effect is correct?
-
A.
It is a permanent effect
-
B.
It is a temporary effect
-
C.
It only affects alkenes
-
D.
It increases basicity
Solution
Inductive effect is a permanent effect due to the electronegativity of atoms or groups.
Correct Answer: A — It is a permanent effect
Learn More →
Q. Which of the following statements about mesomeric effect is true?
-
A.
It involves only sigma bonds.
-
B.
It is a permanent effect.
-
C.
It is weaker than the inductive effect.
-
D.
It does not involve resonance structures.
Solution
The mesomeric effect is a permanent effect that involves the delocalization of electrons through pi bonds and resonance structures.
Correct Answer: B — It is a permanent effect.
Learn More →
Q. Which of the following statements is false regarding inductive effect?
-
A.
It is a permanent effect
-
B.
It decreases with distance
-
C.
It is stronger than mesomeric effect
-
D.
It can be +I or -I
Solution
The inductive effect is generally weaker than the mesomeric effect.
Correct Answer: C — It is stronger than mesomeric effect
Learn More →
Q. Which of the following statements is false regarding the inductive effect?
-
A.
It is a permanent effect.
-
B.
It operates through sigma bonds.
-
C.
It can be observed in both aliphatic and aromatic compounds.
-
D.
It involves the delocalization of pi electrons.
Solution
The inductive effect does not involve the delocalization of pi electrons; that is characteristic of the mesomeric effect.
Correct Answer: D — It involves the delocalization of pi electrons.
Learn More →
Q. Which of the following statements is true regarding mesomeric effect?
-
A.
It is a permanent effect
-
B.
It is a temporary effect
-
C.
It only applies to alkenes
-
D.
It increases acidity
Solution
The mesomeric effect is a permanent effect due to the delocalization of electrons.
Correct Answer: A — It is a permanent effect
Learn More →
Q. Which of the following statements is true regarding the -I effect?
-
A.
It stabilizes carbocations
-
B.
It destabilizes carbanions
-
C.
It withdraws electron density
-
D.
It donates electron density
Solution
-I effect withdraws electron density, which can destabilize carbocations and stabilize carbanions.
Correct Answer: C — It withdraws electron density
Learn More →
Q. Which of the following statements is true regarding the inductive effect?
-
A.
It is a temporary effect.
-
B.
It operates through pi bonds.
-
C.
It is stronger than the mesomeric effect.
-
D.
It decreases with distance.
Solution
The inductive effect decreases with distance from the electronegative atom or group.
Correct Answer: D — It decreases with distance.
Learn More →
Q. Which of the following statements is true regarding the mesomeric effect?
-
A.
It can only be observed in aliphatic compounds.
-
B.
It involves the movement of sigma electrons.
-
C.
It is responsible for the stability of resonance structures.
-
D.
It is a short-range effect.
Solution
The mesomeric effect is responsible for the stability of resonance structures due to the delocalization of pi electrons.
Correct Answer: C — It is responsible for the stability of resonance structures.
Learn More →
Q. Which substituent has both +M and -I effects?
-
A.
-OH
-
B.
-NH2
-
C.
-COOH
-
D.
-NO2
Solution
-NH2 has a +M effect due to resonance donation and a -I effect due to electronegativity.
Correct Answer: B — -NH2
Learn More →
Q. Which substituent is a strong +I and +M director?
-
A.
-NO2
-
B.
-OH
-
C.
-CN
-
D.
-COOH
Solution
-OH is a strong +I and +M director due to its ability to donate electron density through resonance.
Correct Answer: B — -OH
Learn More →
Q. Which substituent is a strong +M director?
-
A.
-CHO
-
B.
-NO2
-
C.
-OH
-
D.
-Br
Solution
The -OH group is a strong +M director due to its ability to donate electron density through resonance.
Correct Answer: C — -OH
Learn More →
Showing 61 to 76 of 76 (3 Pages)
