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

Can sodium ethoxide and t-butyl chloride be used for the preparation of t-butyl ethyl ether? Give suitable explanation. Justify your answer by suggesting the appropriate starting material required for preparation of t-butyl ethyl ether.

Give the IUPAC name of above mentioned ether.

Alkenes are formed by heating alcohols with conc. H$_2$SO$_4$. The first step in the reaction is:

Write chemical equations of the following reactions:
(i) Phenol is treated with conc. HNO$_3$
(ii) Propene is treated with B$_2$H$_6$ followed by oxidation by H$_2$O$_2$/OH$^-$
(iii) Sodium t-butoxide is treated with CH$_3$Cl

Give a simple chemical test to distinguish between butan-1-ol and butan-2-ol.

Arrange the following in increasing order of acid strength: phenol, ethanol, water.

An organic compound ‘A’, molecular formula C$_6$H$_6$O oxidises with CrO$_3$ to form a compound ‘B’. Compound ‘B’ on warming with iodine and aqueous solution of NaOH gives a yellow precipitate of compound ‘C’. When compound ‘A’ is heated with conc. H$_2$SO$_4$ at 413 K gives a compound ‘D’, which on reaction with excess HI gives compound ‘E’. Identify compounds ‘A’, ‘B’, ‘C’, ‘D’ and ‘E’ and write chemical equations involved.

How will you convert the following:
(i) Toluene to benzoic acid
(ii) Ethanol to propan-2-ol
(iii) Propanal to 2-hydroxy propanoic acid

What will be formed after oxidation reaction of secondary alcohol with chromic anhydride (CrO$_3$)?

The conversion of phenol to salicylic acid can be accomplished by

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.

Assertion (A): The boiling point of ethanol is higher than that of methoxymethane.
Reason (R): There is intramolecular hydrogen bonding in ethanol.

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

Arrange the following compounds in increasing order of their boiling points:

Give a simple chemical test to distinguish between butan-1-ol and butan-2-ol.

The conversion of phenol to salicylic acid can be accomplished by

What will be formed after oxidation of secondary alcohol with chromic anhydride (CrO3)?

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:

Write the mechanism of the following reaction: \[ \text{CH}_3\text{CH}_2\text{OH} \xrightarrow{H^+ \, 443\, \text{K}} \text{CH}_2 = \text{CH}_2 \]

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) $NaBH_4$
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