Which of the following does not have a coordinate bond ?

Options

A. `SO_(2)`
B. `HNO_(3)`
C. `H_(2)SO_(3)`
D. `HNO_(2)`

Explanation

To determine which of the given compounds does not have a coordinate bond, we will analyze the bonding in each compound step by step.

### Step 1: Understand Coordinate Bonds
A coordinate bond (or dative bond) is formed when one atom donates both of the electrons in a shared pair to another atom. In this bond, one atom contributes a lone pair of electrons, while the other atom does not contribute any electrons to the bond.

### Step 2: Analyze Each Compound

#### A. SO2 (Sulfur Dioxide)
1. Sulfur has 6 valence electrons and each oxygen has 6 valence electrons.
2. In SO2, sulfur forms two double bonds with two oxygen atoms.
3. One of the oxygen atoms can donate a lone pair to sulfur, forming a coordinate bond.
4. Therefore, SO2 has a coordinate bond.

#### B. HNO3 (Nitric Acid)
1. Nitrogen has 5 valence electrons, each oxygen has 6, and hydrogen has 1.
2. In HNO3, nitrogen forms one double bond with one oxygen and single bonds with the other oxygen and hydrogen.
3. The nitrogen can use a lone pair to form a coordinate bond with one of the oxygens.
4. Therefore, HNO3 has a coordinate bond.

#### C. H2SO3 (Sulfurous Acid)
1. Sulfur has 6 valence electrons, each oxygen has 6, and hydrogen has 1.
2. In H2SO3, sulfur forms two single bonds with two hydroxyl groups (OH) and one double bond with an oxygen atom.
3. The sulfur can donate a lone pair to form a coordinate bond with the remaining oxygen.
4. Therefore, H2SO3 has a coordinate bond.

#### D. HNO2 (Nitrous Acid)
1. Nitrogen has 5 valence electrons, each oxygen has 6, and hydrogen has 1.
2. In HNO2, nitrogen forms one double bond with one oxygen and a single bond with the hydroxyl group (OH).
3. The nitrogen does not have a lone pair available to donate to form a coordinate bond.
4. Therefore, HNO2 does not have a coordinate bond.

### Conclusion
The compound that does not have a coordinate bond is **HNO2**.

### Final Answer
**D. HNO2**

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