Question

Which of the following is/are permanent electronic displacement effect(s)?

• A. Inductive effect
• B. Resonance effect
• C. Electromeric effect
• D. Hyperconjugation

Answer 1

Answer: (A), (B), (D)

The correct options are
A Inductive effect
B Resonance effect
D Hyperconjugation

Electron displacement effect:
Occurs due to the displacement of shared electrons in an organic compound
Electron displacement effect can be categorised into :
A. Permanent effect
B. Temporary effect
Permanent effect :
Permanent displacement of electrons causing permanent polarization of a bond. It arises due to the influence of an atom/group present in the molecule.
Temporary effect :
Temporary displacement of electrons in compounds having multiple bonds, It is observed only in the presence of an attacking reagent. Annulled as soon as the attacking reagent is removed
Permanent effect:
(i) Inductive effect (I)
(ii)Resonance Effect (R)/ Mesomeric Effect (M)
(iii) Hyperconjugation (H)
Temporary effect:
(i) Electromeric effect