Select the correct statement
(i). Delocalisation of `sigma`-electron is hyperconjugation.
(ii). Delocalisation of `pi`-electron is resonance.
(iii). Partial displacement of `sigma`-electron is inductive effect.

Options

A. (i) & (iii)
B. (ii) & (iii)
C. (i) & (ii)
D. (i),(ii),(iii)

Answer

To solve the question, we need to evaluate the three statements provided regarding the concepts of hyperconjugation, resonance, and inductive effect in organic chemistry.

### Step-by-Step Solution:

1. **Evaluate Statement (i)**:
- The statement claims that "Delocalisation of sigma-electron is hyperconjugation."
- **Analysis**: Hyperconjugation involves the delocalization of sigma electrons from C-H or C-C bonds to an adjacent empty or partially filled p-orbital or π-bond. This statement is **correct**.

2. **Evaluate Statement (ii)**:
- The statement claims that "Delocalisation of pi-electron is resonance."
- **Analysis**: Resonance refers to the delocalization of pi electrons across adjacent atoms through the overlap of p-orbitals, leading to the stabilization of the molecule. This statement is also **correct**.

3. **Evaluate Statement (iii)**:
- The statement claims that "Partial displacement of sigma-electron is inductive effect."
- **Analysis**: The inductive effect refers to the permanent polarization of sigma bonds due to electronegativity differences between atoms. It involves the shifting of sigma electrons towards more electronegative atoms, which is indeed a correct description of the inductive effect. This statement is also **correct**.

### Conclusion:
All three statements are correct. Therefore, the correct answer is that **all statements (i), (ii), and (iii) are correct**.