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Assertion : Hydrides of N, O and F have ...

Assertion : Hydrides of N, O and F have lower boiling points than the hydrides of their subsequent group members.
Reason : Boiling point depends upon the molecular mass only.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

If both assertion and reason are true but reason is not the correct explanation of assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the assertion-reason question, we will analyze both the assertion and the reason step by step. ### Step 1: Analyze the Assertion **Assertion**: Hydrides of N, O, and F have lower boiling points than the hydrides of their subsequent group members. - **Explanation**: The hydrides of nitrogen (NH₃), oxygen (H₂O), and fluorine (HF) are known to exhibit significant hydrogen bonding due to the high electronegativity of these elements. This hydrogen bonding leads to higher boiling points compared to the hydrides of their subsequent group members (such as phosphine, H₂S, and HCl), which do not exhibit hydrogen bonding to the same extent. ### Step 2: Analyze the Reason **Reason**: Boiling point depends upon molecular mass only. - **Explanation**: This statement is incorrect. While molecular mass can influence boiling points, it is not the only factor. Intermolecular forces, such as hydrogen bonding, dipole-dipole interactions, and London dispersion forces, also play a crucial role in determining boiling points. In the case of the hydrides of N, O, and F, the strong hydrogen bonding significantly raises their boiling points compared to the hydrides of subsequent group members. ### Step 3: Conclusion - Since the assertion is false (the hydrides of N, O, and F have higher boiling points due to hydrogen bonding) and the reason is also false (boiling points depend on more than just molecular mass), both the assertion and the reason are incorrect. ### Final Answer Both the assertion and the reason are false. ---
To solve the assertion-reason question, we will analyze both the assertion and the reason step by step. ### Step 1: Analyze the Assertion **Assertion**: Hydrides of N, O, and F have lower boiling points than the hydrides of their subsequent group members. - **Explanation**: The hydrides of nitrogen (NH₃), oxygen (H₂O), and fluorine (HF) are known to exhibit significant hydrogen bonding due to the high electronegativity of these elements. This hydrogen bonding leads to higher boiling points compared to the hydrides of their subsequent group members (such as phosphine, H₂S, and HCl), which do not exhibit hydrogen bonding to the same extent. ### Step 2: Analyze the Reason ...
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