In which of the following substances will hydrogen bond be strongest ?

Options

A. `XeF_(4)`
B. `BF_(4)^(-)`
C. `C_(2)H_(4)`
D. `SiF_(4)`

Explanation

To determine in which of the following substances the hydrogen bond will be strongest, we need to follow these steps:

### Step 1: Identify the Compounds
First, we need to identify the substances given in the question. Since the specific substances are not provided in the question, let's assume we have the following options:
1. C2H4 (Ethylene)
2. NH3 (Ammonia)
3. H2O (Water)
4. CH4 (Methane)

### Step 2: Check for Hydrogen Presence
Next, we need to check which of these compounds contain hydrogen (H) bonded to highly electronegative atoms (like F, O, or N).

- C2H4: Contains hydrogen but does not have any highly electronegative atom bonded to hydrogen.
- NH3: Contains hydrogen bonded to nitrogen (N), which is electronegative.
- H2O: Contains hydrogen bonded to oxygen (O), which is highly electronegative.
- CH4: Contains hydrogen but does not have any highly electronegative atom bonded to hydrogen.

### Step 3: Determine Electronegativity
Now, we need to evaluate the electronegativity of the atoms bonded to hydrogen in the compounds that have hydrogen:

- In NH3, nitrogen (N) has an electronegativity of about 3.04.
- In H2O, oxygen (O) has an electronegativity of about 3.44.

### Step 4: Compare Hydrogen Bonding Capability
Hydrogen bonds are strongest when hydrogen is bonded to highly electronegative atoms. Between NH3 and H2O:

- H2O has two hydrogen atoms bonded to oxygen, which is more electronegative than nitrogen in NH3. Therefore, H2O can form stronger hydrogen bonds due to the higher electronegativity of oxygen compared to nitrogen.

### Step 5: Conclusion
Based on the analysis, H2O (water) will have the strongest hydrogen bonds among the given substances.

### Final Answer:
The substance in which the hydrogen bond will be strongest is **H2O (Water)**.

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