Start Learning Free

Before You Begin

Question #44398

Difficulty: 8/10 | 🟢 Free

The Question

Phenol is treated with CHCl3CHCl_3 and excess aqueous NaOHNaOH at 340 K340\text{ K}. After complete consumption of CHCl3CHCl_3, the resulting reaction mixture containing the sodium salt of the major product PP is divided into two equal aliquots, XX and YY. Aliquot XX is directly treated with aniline (\ceC6H5NH2\ce{C6H5NH2}) at 298 K298\text{ K}. Aliquot YY is first adjusted to a pH of 4.54.5 using dilute HClHCl, and then treated with aniline at 298 K298\text{ K}. Both mixtures are subsequently subjected to a standard mild aqueous workup. Identify the major organic products isolated from aliquots XX and YY, respectively.

Options

  • A.

    XX: 2-Hydroxybenzaldehyde ; YY: 2-((Phenylimino)methyl)phenol

  • B.

    XX: 2-((Phenylimino)methyl)phenol ; YY: 2-Hydroxybenzaldehyde

  • C.

    XX: 2-((Phenylimino)methyl)phenol ; YY: 2-((Phenylimino)methyl)phenol

  • D.

    XX: 2-Hydroxybenzaldehyde ; YY: 2-(Phenylamino)methylphenol

Check Your Answer

Correct Answer

Step-by-Step Solution

Explanation

How the Examiner Thinks

Mechanism_Trap

Don't get tricked by the process! Learn the mechanical traps used in competitive exam questions.

Concepts Behind This Question

Reimer-Tiemann Reaction|Schiff Base pH Dependence|Nucleophilic Acyl Substitution

Why This Question Is Tricky

Common Mistakes

The question tests the mechanistic constraints of Schiff base formation and the electronic effects of intermediates in the Reimer-Tiemann reaction.

Students often blindly chain reactions (Aldehyde + Amine -> Imine) without considering the pH dependence.

The 'hidden variable' is the strongly basic medium left over from the Reimer-Tiemann reaction.

This high pH completely inhibits imine formation by preventing the acid-catalyzed dehydration of the hemiaminal intermediate and by deactivating the carbonyl group via phenoxide resonance.

Neutralization to pH ~4.5 is strictly required for the reaction to proceed.

Quick Facts About This Question

Question Information

SubjectChemistry
ChapterAlcohols, Phenols, and Ethers - Class 12
ConceptReimer-Tiemann Reaction
Difficulty8
Cognitive Load7
Target Solve Time160 sec
AccessFree