Assertion : The atoms in a covalent molecule are said to share electrons, yet some covalent molecule are polar.
Reason :In a polar covalent molecule , the shared electron spend more time on the average near one of the atoms .

Options

A. If assertion is true but the reason is false
B. If assertion is false but reason is true
C. IF both assertion and reason are true and the reason is the correct explanation of assertion
D. If both assertion and reason are true but reason is not the correct explanation of assertion

Answer

**Step-by-Step Solution:**

1. **Understanding the Assertion:**
- The assertion states that atoms in a covalent molecule share electrons, yet some covalent molecules are polar.
- In a covalent bond, atoms share electrons to achieve a full outer shell. For example, in hydrogen chloride (HCl), hydrogen shares its single electron with chlorine, which needs one electron to complete its octet.

2. **Identifying Polar Covalent Bonds:**
- A polar covalent bond occurs when there is a significant difference in electronegativity between the two atoms involved in the bond.
- In the case of HCl, chlorine is more electronegative than hydrogen. This means chlorine attracts the shared electrons more strongly than hydrogen does.

3. **Analyzing the Reason:**
- The reason states that in a polar covalent molecule, the shared electrons spend more time near one of the atoms.
- This is true because the more electronegative atom (chlorine in HCl) pulls the shared electrons closer to itself, resulting in a partial negative charge on chlorine and a partial positive charge on hydrogen.

4. **Conclusion:**
- Both the assertion and the reason are true. The reason correctly explains the assertion because the unequal sharing of electrons in polar covalent bonds leads to the formation of partial charges, thus making the molecule polar.

5. **Final Answer:**
- The correct option is that both the assertion and reason are true, and the reason is the correct explanation of the assertion.

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