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JEE Advanced levelSingle correct optionDifficulty 3 of 3ap127

Assertion (A): 2-Nitrophenol is steam volatile whereas 4-nitrophenol is not. Reason (R): 2-Nitrophenol has intramolecular hydrogen bonding, whereas 4-nitrophenol has intermolecular hydrogen bonding.

  1. ABoth A and R are true and R is the correct explanation of A
  2. BBoth A and R are true but R is not the correct explanation of A
  3. CA is true but R is false
  4. DA is false but R is true

Answer: A

Intramolecular hydrogen bonding between and the neighbouring in 2-nitrophenol lowers its association and boiling behaviour so that it is steam volatile. 4-Nitrophenol molecules are linked intermolecularly, giving a higher boiling point and lower volatility. R correctly explains A.
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