Resonance Effect

Organic Chemistry: Some Basic Principles & Techniques - Electronic Effect|Electron Movement In Organic Chemical Reaction|Electron Displacement Effect In Covalent Bond|Inductive Effect|Resonance Effect|OMR|Summary

Which among the following statements are true with respect to electronic displacement in a covalent bond? (1) Inductive effect operates through a pi - bond (2) Resonance effect operates through a sigma -bond (3) Inductive effect operates through a sigma -bond (4) Resonance effect operates through a pi- bond (5) Resonance and inductive effects operate through sigma -bond