Advertisements
Advertisements
Question
Write chemical reactions to convert phenol into salicyaldehyde. Write the name of the reaction. What happens when if CCl4 is used instead of CHCl3 in the above reaction.
Advertisements
Solution
- Phenol to salicyaldehyde: When phenol is treated with chloroform in an aqueous sodium hydroxide solution followed by hydrolysis with acid, salicylaldehyde is formed.
- This reaction is known as the Reimer-Tiemann reaction.
- If the solvent chloroform (CHCl3) is replaced by carbon tetrachloride (CCl4), salicylic acid is formed.
APPEARS IN
RELATED QUESTIONS
Answer in brief.
Give the reagents and conditions necessary to prepare phenol from Benzene sulfonic acid.
Answer in brief.
Explain why p-nitrophenol is a stronger acid than phenol.
Answer in brief.
Give the equations of the reactions for the preparation of phenol from isopropyl benezene.
Oxidation of ethyl alcohol using K2Cr2O7/dil H2SO4 leads to formation of _______________
When vapours of tert.butyl alcohol are passed over hot copper, it gives _____________
Draw intramolecular hydrogen bonding structure in o-nitrophenol.
What is the action of following on phenol at low temperature?
- dil. HNO3
- conc. H2SO4
- Br2/CS2
How will you bring about the following conversions?
2-methyl propan-2-ol to 2-methylpropene
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?
Phenol is obtained from cumene ____________.
Propane when treated with cold cone. H2SO4 forms a compound which on heating with water gives ______.
The number of isomeric alcohols possible with the formula C4H10O is ____________.
The product 'C' in the following reaction is:
\[\ce{CH3CH2Br ->[alc. KCN] {'A'} ->[H3O^+][\Delta] {'B'} ->[i. LiAlH4][ii. H3O^+] {'C'}}\]
____________ will NOT undergo acetylation.
In Raschig's method for synthesis of phenol, the reactants used are ____________.
\[\ce{Isopropyl alcohol + acidic K2Cr2O7 -> X}\]
Identify product 'X' in the above reactions.
What is INCORRECT about the product written in the below given reaction?
\[\ce{R - CH2 - OH ->[PCC] R - COOH}\]
Which isomer of C4H10O is optically active?
Identify the reagent A used in the following conversion.
\[\ce{Phenol ->[A] Benzoquinone}\]
Which of the following on oxidation yields ethyl methyl ketone?
Identify the alcohol that reacts immediately with Lucas reagent?
A reaction of phenol with chloroform in presence of sodium hydroxide to form salicylaldehyde is known as ____________.
The compound which reacts fastest with Lucas reagent at room temperature is ______.
Name the catalyst used in commercial method of preparation of phenol.
The order of reactivity of hydrogen halides with ether is as follows.
Convert the following :
cumene to phenol.
