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प्रश्न
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.
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उत्तर
- 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.
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संबंधित प्रश्न
Answer in brief.
Give the reagents and conditions necessary to prepare phenol from Benzene sulfonic acid.
An ether (A), C5H12O, when heated with excess of hot HI produce two alkyl halides which on hydrolysis form compound (B) and (C), oxidation of (B) gave and acid (D), whereas oxidation of (C) gave a ketone (E). Deduce the structural formula of (A), (B), (C), (D), and (E).
Reaction between hot conc. HI and anisole gives ______________
Write the name of major product when anisole reacts HI at 398 K
Draw intramolecular hydrogen bonding structure in o-nitrophenol.
How will you bring about the following conversions?
acetone to 2-methylpropan-2-ol
Phenol reacts with concentrated nitric acid in the presence of cone. H2SO4 to form ____________.
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 ____________.
What is the product of the following reaction?
\[\ce{CH3 - CH2 - CH2 - OH ->[conc. H2SO4][\Delta]}\]
\[\ce{CH3 - CH = CH2 ->[HBr][Peroxide] A}\]
Identify A.
The product 'C' in the following reaction is:
\[\ce{CH3CH2Br ->[alc. KCN] {'A'} ->[H3O^+][\Delta] {'B'} ->[i. LiAlH4][ii. H3O^+] {'C'}}\]
The number of σ bonds in carbolic acid is ______.
Which among the following is allylic secondary alcohol?
Which of the following compounds does NOT react with sodium metal?
Identify the role of PDC from the following.
Identify the product X in the following reaction.
\[\ce{Phenol ->[Na2Cr2O7][H2SO4] X}\]
The compound which reacts fastest with Lucas reagent at room temperature is ______.
What is the product obtained in Reimer - Tiemann reaction?
The chemical test that distinguish between benzoic acid and phenol is ______.
The order of reactivity of hydrogen halides with ether is as follows.
Explain the reaction of 1° and 2° alcohol with oxidising agent chromic anhydride (CrO3).
Convert the following :
cumene to phenol.
Arrange the following compounds in order of decreasing acidity:
