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प्रश्न
What is the action of following on phenol at low temperature?
- dil. HNO3
- conc. H2SO4
- Br2/CS2
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उत्तर
- Dilute HNO3: Phenol reacts with dilute nitric acid at low temperature to give a mixture of ortho- and para-nitrophenol.
- Conc. H2SO4: At room temperature (298 K), phenol reacts with concentrated sulphuric acid to form o-phenolsulphonic acid.
- Br2 in CS2: When a reaction is carried out in a solvent of lower polarity like CS2 a mixture of ortho- and para-bromophenol is formed.
संबंधित प्रश्न
Write two points of difference between the properties of phenol and ethyl alcohol.
Answer in brief.
Give the reagents and conditions necessary to prepare phenol from Benzene sulfonic acid.
Answer in brief.
Give the equations of the reactions for the preparation of phenol from isopropyl benezene.
Number of oxygen atoms present in salicylaldehyde are ______.
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.
Phenoxide ion is more stable than phenol due to the ____________.
Which of the following is INCORRECT regarding phenol?
The most resistant alcohol towards oxidation reaction is:
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.
(I)
(II) \[\ce{P + Zn ->[\Delta] Q}\]
(III) \[\ce{P ->[Na2Cr2O7][H2SO4] R}\]
Q and R are respectively:
Which of the following conversion explains the acidic nature of alcohols?
Which isomer of C4H10O is optically active?
Identify 'Z' in the following series of reaction:
\[\ce{Butan - 2 - ol ->[PCl3] X ->[alco. KOH] Y ->[i) H2SO4][ii) H-OH/heat] Z}\]
Identify the reagent A used in the following conversion.
\[\ce{Phenol ->[A] Benzoquinone}\]
Which of the following on oxidation yields ethyl methyl ketone?
A reaction of phenol with chloroform in presence of sodium hydroxide to form salicylaldehyde is known as ____________.
Identify the role of PDC from the following.
Which among the following phenolic compound is most acidic in nature?
Identify the compound amongst the following of which 0.1 M aqueous solution has highest boiling point.
Product (B) in this reaction is:
Which among the following is not the method of preparation of phenol?
Arrange O - H, C - H and N - H bonds in increasing order of their bond polarity.
Explain: Phenols are acid while alcohol is neutral.
The structure of A in the given reaction is:
What is the name of isopropyl alcohol according to the carbinol system?
