In each of the following pairs, predict which has higher value of the property mentioned:
`{:((i)HF","HCl,:,"Polar character"),((ii)NH_(3)","H_(2)O,:,"Bond angle"),((iii)KCl","KF,:,"Lattice enthalpy"),((iv)NF_(3)","NH_(3),:,"Dipole moment"),((v)C_(2)H_(2)","C_(2)H_(4),:,"s - character in the hybridisation of carbon"):}`

Explanation

To solve the question, we will analyze each pair of compounds based on the property mentioned and determine which one has the higher value.

### Step-by-Step Solution:

1. **Pair (i): HF vs HCl (Polar character)**
- **Analysis**: The polar character of a molecule is determined by the difference in electronegativity between the bonded atoms. Fluorine (F) is more electronegative than chlorine (Cl).
- **Conclusion**: HF has a higher polar character than HCl due to the greater electronegativity difference.
- **Answer**: **HF**
...