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प्रश्न
Explain the following with an example.
Kolbe’s reaction.
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उत्तर
Phenoxide ion generated by treating phenol with sodium hydroxide is even more reactive than phenol towards electrophilic aromatic substitution. Hence, it undergoes electrophilic substitution with carbon dioxide, a weak electrophile. Ortho hydroxybenzoic acid is formed as the main reaction product.
संबंधित प्रश्न
Give simple chemical tests to distinguish between the following pairs of compounds: Benzoic acid and Phenol
Write the main product(s) in each of the following reactions:
Write the structures of A, B, C, D and E in the following reactions:
Write the equation involved in the following reaction:
Kolbe’s reaction
Name the reagent used in the following reaction:
Bromination of phenol to 2, 4, 6-tribromophenol.
Write the reaction involved in the following:
Friedal-Crafts Alkylation of Phenol
When phenol is treated with excess bromine water, it gives:
When phenol is heated with CHCl3 and alcoholic KOH when salicylaldehyde is produced. This reaction is known as ____________.
On distilling phenol with Zn dust, one gets:
In the reaction of phenol with CHCl3 and aqueous NaOH at 343 K, the electrophile attacking the ring is:
\[\ce{C2H5OH + SOCl2 ->[Pyridine] C2H5Cl + SO2 + HCl}\]
The above reaction is known as:
Phenol does not undergo nucleophilic substitution reaction easily due to ______.
Which of the following are used to convert \[\ce{RCHO}\] into \[\ce{RCH2OH}\]?
(i) \[\ce{H2/Pd}\]
(ii) \[\ce{LiAlH4}\]
(iii) \[\ce{NaBH4}\]
(iv) Reaction with \[\ce{RMgX}\] followed by hydrolysis
Out of o-nitrophenol and p-nitrophenol, which is more volatile? Explain.
Nitration is an example of aromatic electrophilic substitution and its rate depends upon the group already present in the benzene ring. Out of benzene and phenol, which one is more easily nitrated and why?
Write the chemical equation involved in the following reactions:
Acetylation of salicylic add
Write the name of the reaction, structure and IUPAC name of the product formed when:
Phenol reacts with CHCl3 in the presence of NaOH followed by hydrolysis.
