Why HF forms H-bonding with ethyne even though it is non-polar in nature ?

Explanation

To understand why HF forms hydrogen bonding with ethyne (C2H2), despite ethyne being non-polar, we need to analyze the properties of both HF and ethyne, as well as the nature of hydrogen bonding.

### Step-by-Step Solution:

1. **Understanding Hydrogen Bonding**:
- Hydrogen bonding occurs when a hydrogen atom covalently bonded to a highly electronegative atom (like F, O, or N) interacts with another electronegative atom. This interaction is due to the polar nature of the bond, which creates a partial positive charge on the hydrogen and a partial negative charge on the electronegative atom.

2. **Properties of HF**:
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