List of top Chemistry Questions on Alcohols, Phenols And Ethers asked in CBSE CLASS XII

Write the IUPAC name of the product formed in the Reimer-Tiemann reaction. 

Give a simple chemical test to distinguish between butan-1-ol and butan-2-ol.
Write chemical equations of the following reactions:
(i) Phenol is treated with conc. HNO3.
(ii) Propene is treated with B2H6 followed by oxidation by H2O2/OH−.
(iii) Sodium t-butoxide is treated with CH3Cl.
What will be formed after oxidation of secondary alcohol with chromic anhydride (CrO3)?
The conversion of phenol to salicylic acid can be accomplished by
Phenols undergo electrophilic substitution reactions readily due to the strong activating effect of the OH group attached to the benzene ring. Since the OH group increases the electron density more to the ortho- and para- positions, one of the examples of the aldehyde group being introduced on the aromatic ring of phenol, ortho to the hydroxyl group. This is a general method used for the ortho-formylation of phenols.
Answer the following questions:
Assertion (A): The boiling point of ethanol is higher than that of methoxymethane.
Reason (R): There is intramolecular hydrogen bonding in ethanol.
Arrange the following compounds in increasing order of their boiling points: increasing order of their boiling points
Write the mechanism of the following reaction: CH3CH2OH→H+ 443 KCH2=CH2 \text{CH}_3\text{CH}_2\text{OH} \xrightarrow{H^+ \, 443\, \text{K}} \text{CH}_2 = \text{CH}_2
Nucleophilic addition of Grignard reagent to ketones followed by hydrolysis with dilute acids forms:
Assertion (A): p-nitrophenol is less acidic than phenol.
Reason (R): Nitro group is electron-withdrawing and helps in the stabilization of p-nitrophenoxide ion.
Match the reagents required for the given reactions: I. Oxidation of primary alcohols to aldehydes (p) NaBH4NaBH_4
II. Butan-2-one to Butan-2-ol (q) 85% phosphoric acid at 440 K
III. Bromination of Phenol to 2, 4, 6- (r) PCC Tribromophenol
IV. Dehydration of propan-2-ol to (s) Bromine water propene
Phenol on reaction with aqueous bromine at room temperature gives:
Dehydration of tertiary alcohols with Cu at 573 K gives:
Give the equations of reactions for the preparation of: (any three) (a) Phenol from chlorobenzene
(b) Salicyaldehyde from phenol
(c) 2-Methoxyacetophenone from anisole
Ethanol on heating with conc. H2_2SO4_4 at 413 K gives:
Assertion (A): Phenol on reaction with aqueous NaOH gives sodium phenoxide.
Reason (R): This reaction supports the acidic nature of phenol.
Write the reactions involved in the following:
(i) Reimer-Tiemann reaction
(ii) Kolbe’s reaction
Assertion (A): Boiling point of butan-1-ol is higher than that of butan-1-amine. Reason (R): Being more polar, butan-1-ol forms stronger intermolecular hydrogen bonds as compared to butan-1-amine.
CH3_3-O-CH3_3 when treated with excess HI gives:
Consider the following reaction:
benzyl alcohol (C6H5CH2OH)
The major product obtained is:

Name the reagents used in the following reactions:

(i)Oxidation of a primary alcohol to carboxylic acid. 

(ii)Oxidation of a primary alcohol to aldehyde.

(iii)Bromination of phenol to 2,4,6-tribromophenol.

(iv)Benzyl alcohol to benzoic acid.

(v)Dehydration of propan-2-ol to propane.

(vi)Butan-2-one to butan-2-ol.

(B) (b) Give a simple chemical test to distinguish between butan-1-ol and butan-2-ol.
(B) (b) Give a simple chemical test to distinguish between butan-1-ol and butan-2-ol.

Write equations of the following reactions: 
(i)Friedel-Crafts reaction–alkylation of anisole.
(ii)Nitration of anisole.

(iii)Bromination of anisole in ethanoic acid medium.
(iv)Friedel-Craft’s acetylation of anisole.