BITSAT 2017
- Exam
- BITSAT
- Year
- 2017
- Subject
- Chemistry
- Chapter
- Haloalkanes and Haloarenes
BITSAT 2017 · Chemistry · Haloalkanes and Haloarenes
Chlorobenzene Reaction - ( X ) → Phenol Reaction - ( Y ) →...
Chlorobenzene\overset{Reaction - ( X )}{→}Phenol\overset{Reaction - ( Y )}{→}SalicylaldehydeX ' 'Y ' ' respectively are
Options
- AFries rearrangement and Kolbe
- BCumene and Reimer-Tiemann
- CDow and Reimer-Tiemann
- DDow and Sandmeyer.
Correct answer
C. Dow and Reimer-Tiemann
Step-by-step solution
Phenol is manufactured by heating chlorobenzene with 10% aqueous NaOH solution at about 623K under 300 atm and in the presence of copper salt acting as a catalyst to form sodium phenoxide. The sodium salt when treated with dil. HCl, gives phenol. This method is known as Dow's process.&
When phenol is heated with & in the presence of aqueous& NaOH, an aldehydic group& (−CHO)& get introduced in the ring at a position ortho to the phenolic group. This reaction is known as the Reimer-Tiemann reaction.
