When phenol is reacted with CHCl3 and NaOH followed by acidification, salicyladehyde is obtained. Which of the following species are involved in the above mentioned reaction as intermediate?

Question

When phenol is reacted with CHCl3 and NaOH followed by acidification, salicyladehyde is obtained. Which of the following species are involved in the above mentioned reaction as intermediate? (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

Riemer-Tiemann reaction involves electrophilic substitution on the highly reactive phenoxide ring HCCl3+OH- → H2O+-: CCl3: overset-C Cl3 → Cl-+ underset textC has only a sextet of electrons:CCl2 <img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/chemistry/031063d333634c6b44841d8298aee36a-.png" />

Q. When phenol is reacted with $C H C l_{3}$ and $N a O H$ followed by acidification, salicyladehyde is obtained. Which of the following species are involved in the above mentioned reaction as intermediate?

Riemer-Tiemann reaction involves electrophilic substitution on the highly reactive phenoxide ring
$H CC l_{3} + O H^{-} \to H_{2} O +^{-} : CC l_{3}$
$: C - C l_{3} \to C l^{-} + C has only a sextet of electrons : CC l_{2}$

Q. When phenol is reacted with CHCl3​ and NaOH followed by acidification, salicyladehyde is obtained. Which of the following species are involved in the above mentioned reaction as intermediate?

Riemer-Tiemann reaction involves electrophilic substitution on the highly reactive phenoxide ring HCCl3​+OH−→H2​O+−:CCl3​ :C−Cl3​→Cl−+C has only a sextet of electrons:CCl2​​

Q. When phenol is reacted with $C H C l_{3}$ and $N a O H$ followed by acidification, salicyladehyde is obtained. Which of the following species are involved in the above mentioned reaction as intermediate?

Riemer-Tiemann reaction involves electrophilic substitution on the highly reactive phenoxide ring
$H CC l_{3} + O H^{-} \to H_{2} O +^{-} : CC l_{3}$
$: C - C l_{3} \to C l^{-} + C has only a sextet of electrons : CC l_{2}$