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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ap104

Which of the following reactions of phenol give the product stated?

  1. A in at low temperature: 4-bromophenol as the main product
  2. Bconc. with conc. : 2,4,6-trinitrophenol
  3. C/aqueous at 340 K, then : 2-hydroxybenzaldehyde
  4. Ddilute at 298 K: 2,4,6-trinitrophenol

Answer: A, B, C

Reimer-Tiemann formylation gives mainly the ortho aldehyde. In a non-polar solvent such as at low temperature phenol brominates once, mainly para. Conc. / gives picric acid. Dilute at 298 K gives only a mixture of 2-nitrophenol and 4-nitrophenol.
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