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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ph053

Select the correct statement(s) about the hydrogen halides.

  1. AThe order of acid strength in water is .
  2. BThe order of boiling points is .
  3. CThe thermal stability is highest for .
  4. DThe order of H-X bond dissociation enthalpy is .

Answer: B, D

A: HF is hydrogen bonded, and the others rise with molar mass. B: bond length increases down the group. C is wrong because the weakest bond (H-I) makes HI the least stable. D is the reverse of the real order, as acidity increases from HF to HI.
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