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  5. The p-Block Elements-I / p-ब्लॉक के कुछ तत्व-I

12th Class Chemistry The p-Block Elements-I / p-ब्लॉक के कुछ तत्व-I Question Bank MCQs - The p-Block Elements

  • question_answer
    Which is the correct arrangement of the compounds based on their bond strength?

    A) \[HF\text{ }>\text{ }HCl\text{ }>\text{ }HBr\text{ }>\text{ }HI\]

    B) \[HI\text{ }>\text{ }HBr\text{ }>\text{ }HCl\text{ }>\text{ }HF\]

    C) \[HCl\text{ }>\text{ }HF\text{ }>\text{ }HBr\text{ }>\text{ }HI\]

    D) \[HF\text{ }>\text{ }HBr\text{ }>\text{ }HCl\text{ }>\text{ }HI\]

    Correct Answer: A

    Solution :

    Bond strength \[\propto \frac{1}{Bond\,length}\] Bond length Bond length : \[HI\text{ }>\text{ }HBr\text{ }>\text{ }HCl\text{ }>\text{ }HF\] Hence, Bond strength : \[HF\text{ }>\text{ }HCl\text{ }>\text{ }HBr\text{ }>\text{ }HI\] As we move down the group from F to I, the atomic size increases thus, the bond length (H - X) increases hence, the bond strength decreases from HF to HI.


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