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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3cb218

Which of the following statements are correct?

  1. A has the highest boiling point among the hydrogen halides
  2. Bp-Nitrophenol has a higher boiling point than o-nitrophenol
  3. CA cyclic dimer of ethanoic acid is held together by two hydrogen bonds
  4. DIce is less dense than water because each molecule forms fewer hydrogen bonds in ice

Answer: A, B, C

is hydrogen bonded, so statement 1 is true. p-Nitrophenol is intermolecularly bonded while the ortho isomer is intramolecularly bonded, so statement 2 is true. The ethanoic acid dimer has two O-H...O bonds. Statement 4 is wrong: ice has more complete hydrogen bonding (four per molecule), which forces an open structure.
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