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JEE Main levelSingle correct optionDifficulty 2 of 3si075

Assertion (A): The O-H stretching band of a carboxylic acid is broader than that of a dilute alcohol solution. Reason (R): Carboxylic acids exist as hydrogen-bonded dimers.

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

Answer: D

Strong hydrogen bonding in carboxylic acid dimers gives a very broad O-H band (about 2500-3300 ). Both statements are true and the dimerisation is the reason for the broadening.
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