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11th Class Chemistry Chemical Bonding and Molecular Structure / रासायनिक आबंधन एवं आणविक संरचना Question Bank 11th CBSE Chemistry Chemical Bonding and Molecular Structure

  • question_answer
    When we move from \[HF\] to \[HCl,\]  the boiling point drops sharply but on moving further to \[HBr\]  and \[HI\] the boiling point increases. Why? or Out of \[HF\],\[HCl,\]\[HBr\]  and \[HI\], which has lowest boiling point and why?

    Answer:

                    In \[H-F\] there is H-bonding. Hence, the boiling point is high. There is no H-bonding in \[HCl\]. So the boiling point is less. On moving further to \[HBr\] and \[HI\], the size of the molecule increases and so the van der Waals forces increase and so does the boiling point. Hence, \[HCl\] has the lowest boiling point.


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