Arrange the following in the order of property indicated for each set:
(i). `F_2,Cl_2,Br_2I_2-` increasing bond dissociation enthaply.
(ii). `HF,HCl,HBr,HI`- increasing acid strength.
(iii). `NH_3,PH_3,AsH_3,SbH_3,BiH_3-` increasing base strength.

Explanation

To solve the question, we will break it down into three parts as indicated, and analyze each set of elements based on the property mentioned.

### Part (i): Increasing Bond Dissociation Enthalpy of `F2, Cl2, Br2, I2`

1. **Understanding Bond Dissociation Enthalpy**: Bond dissociation enthalpy is the energy required to break a bond in a molecule. Generally, stronger bonds have higher bond dissociation enthalpy.

2. **Analyzing the Halogens**:
- **F2**: Fluorine has a small atomic size, which leads to significant electron-electron repulsion in the F-F bond, making it weaker than expected.
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