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प्रश्न
Write Kolbe’s reaction.
उत्तर
The treatment of sodium phenoxide with carbon dioxide at 398 K under the pressure of 6 atm followed by acid-hydrolysis, salicylic acid (o-hydroxybenzoic acid) is formed. This reaction is known as Kolbe’s reaction.
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संबंधित प्रश्न
Answer in one sentence/ word.
Write the name of the electrophile used in Kolbe’s Reaction.
Answer in brief.
Explain why p-nitrophenol is a stronger acid than phenol.
Oxidation of ethyl alcohol using K2Cr2O7/dil H2SO4 leads to formation of _______________
Arrange the following in decreasing order of acid strength.
CH3OH, CH3–CH2–OH, CH3–CH(OH)–CH3, (CH3)3–C–OH
Write IUPAC name of crotonyl alcohol.
Draw intramolecular hydrogen bonding structure in o-nitrophenol.
Write the reactions involved in the preparation of phenol from benzene sulfonic acid.
What is the action of following on phenol at low temperature?
- dil. HNO3
- conc. H2SO4
- Br2/CS2
An unknown alcohol is treated with Lucas reagent. Explain how you will determine whether the alcohol is primary, secondary or tertiary. Indicate by chemical equation the reaction between isopropyl alcohol and Lucas reagent.
What is the action of conc. H2SO4 on carbolic acid at 373 K.
An organic compound gives hydrogen on reaction with sodium metal. It forms an aldehyde with molecular formula C2H4O on oxidation with pyridinium chlorochromate. Give the chemical equations in support of these observations.
Which of the following reagents are required in the conversion of phenol to salicylic acid?
Which of the following compounds is obtained, when phenol react with bromine water?
The CORRECT decreasing order of boiling points for isomeric primary (1°), secondary (2°) and tertiary (3°) alcohols is ____________.
Phenol is ____________.
Carbolic acid is oxidised by acidified sodium dichromate to give ______.
Which of the following is INCORRECT regarding phenol?
Which of the following reagents is used to convert phenol to benzene?
Which among the following compounds is used to prepare solid fuel using calcium acetate?
Identify 'Z' in the following series of reaction:
\[\ce{Butan - 2 - ol ->[PCl3] X ->[alco. KOH] Y ->[i) H2SO4][ii) H-OH/heat] Z}\]
Which of the following on oxidation yields ethyl methyl ketone?
Identify the product obtained when phenol is treated with bromine water?
Which of the following compounds has lowest boiling point?
The order of reactivity of hydrogen halides with ether is as follows.
The major product obtained in the following reaction is
Arrange the following compounds in an increasing order of their solubility in water:
Explain the reaction of 1° and 2° alcohol with oxidising agent chromic anhydride (CrO3).
Explain: Phenols are acid while alcohol is neutral.
