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QJEEAdv16Chda47: JEE Advanced 2016 Chemistry - Class 12 JEEAdv16Chda47 Solution: The correct statements about of the following reaction sequence …

The correct statements about of the following reaction sequence is (are)

Cumene (C9H12) ⟶(ii)H3O+(i)O2 P ⟶CHCl3/NaOH Q (major) + R (minor)

Q ⟶PhCH2BrNaOH S

Multiple Choice Options

  • A R is steam volatile.
  • B Q gives dark violet coloration with 1% aqueous FeCl3 solution.
  • C S gives yellow precipitate with 2, 4-dinitrophenylhydrazine.
  • D S gives dark violet coloration with 1% aqueous FeCl3 solution.

Step-by-Step Verified Solution

JEE Advanced 2016 Paper 1 Offline Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 48 English Explanation

'Q' is steam volatile due to intramolecular hydrogen bonding while 'R' undergoes intermolecular hydrogen bonding hence, has higher boiling point. 'Q' gives dark violet coloration with 1% aqueous FeCl3 solution due to the presence of phenolic group while 'S' gives yellow precipitate with 2, 4-dinitrophenyl hydrazine due to the presence of aldehydic group (−CHO).

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