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JIPMER 2018
Exam
JIPMER
Year
2018
Subject
Chemistry
Chapter
Alcohols Phenols and Ethers

JIPMER 2018 · Chemistry · Alcohols Phenols and Ethers

When phenol is treated with CHCl_3 and NaOH followed by...

When phenol is treated with CHCl3\mathrm{CHCl}_3 and NaOH followed by acidification, salicylaldehyde is obtained. Which of the following species is involved in the above mentioned reaction as intermediates?When phenol is treated with CHCl_3 and NaOH followed by acidification, salicylaldehyde is obtained. Which of theWhen phenol is treated with CHCl_3 and NaOH followed by acidification, salicylaldehyde is obtained. Which of theWhen phenol is treated with CHCl_3 and NaOH followed by acidification, salicylaldehyde is obtained. Which of theWhen phenol is treated with CHCl_3 and NaOH followed by acidification, salicylaldehyde is obtained. Which of theWhen phenol is treated with CHCl_3 and NaOH followed by acidification, salicylaldehyde is obtained. Which of the

Options

  1. AAt what temperature does the H 2 O 2 molecule have a dihedral angle of 90.2° in the solid phase?
  2. BAt what temperature does the H 2 O 2 molecule have a dihedral angle of 90.2° in the solid phase?
  3. CAt what temperature does the H 2 O 2 molecule have a dihedral angle of 90.2° in the solid phase?
  4. DAt what temperature does the H 2 O 2 molecule have a dihedral angle of 90.2° in the solid phase?

Correct answer

A. At what temperature does the H 2 O 2 molecule have a dihedral angle of 90.2° in the solid phase?

Step-by-step solution

On refluxing alkaline solution of phenol with CHCl3\mathrm{CHCl}_3 at 330 K and on subsequent acidification, o-hydroxy benzaldehyde (salicylaldehyde) is obtained. This reaction is known as Riemer Tiemann reaction. Mechanism When phenol is treated with CHCl_3 and NaOH followed by acidification, salicylaldehyde is obtained. Which of the ∴\therefore The correct option is (1)
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