List of top Chemistry Questions on Alcohols, Phenols And Ethers

Why is o-nitrophenol more acidic than o-methoxyphenol?
Assertion (A): Alcohols act as Bronsted bases as well as Bronsted acids.
Reason (R): Alcohols react as both nucleophiles and electrophiles.
An organic compound 'A', with molecular formula $C_2H_6O$ reacts with active metals such as sodium to give compound 'B' and hydrogen gas. 'A' on treatment with iodine and sodium hydroxide gives 'C' and in presence of $H_2SO_4$ at $413~K$ gives 'D' ($C_4H_{10}O$). 'D' on reaction with excess of HI gives 'E'. Identify 'A', 'B', 'C', 'D' and 'E' and write all the reactions involved.
Identify the correct increasing order of boiling points of the given compounds:
Propan-1-ol, butan-1-ol, butan-2-ol, pentan-1-ol
Arrange the following compounds in order of their increasing boiling points: Propan-1-ol, Ethanol, Butan-2-ol, Butan-1-ol
Assertion (A): p-nitrophenol is less acidic than phenol.
Reason (R): Nitro group is an electron-withdrawing group, which stabilises the phenoxide ion.
Propan-2-ol on oxidation with $CrO_{3}$ gives :
Explain by giving four examples that the alkoxy group (-OR) activates the aromatic ring towards electrophilic substitution.
OR
Describe two methods of preparation of phenol. Give two reactions that demonstrate the acidic nature of phenol. Compare the acidity of phenol with that of ethanol.
How will you obtain the following from phenol? (i) Picric acid (ii) Benzoquinone.
(i) Write notes on Williamson's synthesis. (ii) Write the chemical equation for the preparation of phenol from cumene. (iii) How will you convert phenol to salicylaldehyde? (2+1½+1½=5)
OR
What happens when (write chemical equations only): (i) Phenol reacts with dil. HNO3 (ii) Ethyl methyl ether is heated with conc. HI (iii) Phenol is heated with conc. HNO3 in the presence of conc. H2SO4 (iv) Ethyl alcohol reacts with thionyl chloride in the presence of pyridine (v) Phenol reacts with bromine water. (1+1+1+1+1=5)
Ortho nitrophenol is more acidic than phenol. Explain. Draw the resonance structures of their corresponding phenoxide ion. (2)
(i) Explain the mechanism of the formation of ethanol by acid catalyzed hydration of ethene. (ii) Explain hydroboration-oxidation reaction with an example. (2½+2½=5)
OR
What happens when? (Write chemical equations only) (i) Ethyl bromide reacts with sodium ethoxide. (ii) Phenol is heated with conc. HNO3 in the presence of conc. H2SO4. (iii) Methoxybenzene is heated with acetyl chloride in the presence of anhydrous AlCl3. (iv) Phenol reacts with chloroform in the presence of aqueous NaOH. (v) Ethyl methyl ether is heated with conc. HI. (1+1+1+1+1=5)
Explain why phenol is more acidic than ethyl alcohol.
Differentiate between primary, secondary and tertiary alcohols, showing their structure. In the presence of which enzyme does glucose convert to ethyl alcohol? (3+1)
How will you prepare phenol from the following reagents (write only chemical equation)?
i) Benzene
ii) Aniline
IUPAC name of \( CH_3-CH_2-CH(OH)-CH_3 \) is —
Write two reactions of phenol that demonstrate its acidic nature.
Write a method of preparation of diethyl ether and write the mechanism of the reaction of diethyl ether with HI.
Write the structure of (A), (B) and (C) in the following reaction: phenol (C6H5OH) with concentrated HNO3 gives (C); phenol with dilute HNO3 gives (A) + (B).
Write the products of the following reactions:
(i) Phenol (C6H5OH) + CHCl3 + aq. NaOH → ?
(ii) Phenol (C6H5OH) + Zn / Δ → ?
OR
(i) Explain hydrogen bonding in o-nitrophenol and p-nitrophenol.
(ii) What is formed in the nitration of phenol with concentrated HNO3?
Complete the following equations : \[ \text{(i)} @@RAW0@@ \] \[ \text{(ii)} @@RAW1@@ \]
Name the reagents used in the following reactions : (i) Oxidation of a primary alcohol to aldehyde (ii) Oxidation of a primary alcohol to carboxylic acid
Primary, secondary and tertiary alcohols can be distinguished by :
The dehydration of 1$^\circ$, 2$^\circ$ and 3$^\circ$ alcohols follows the order :
Answer the following case-based questions on alcohols, phenols and ethers: \[ (a)\;\text{Name the reagents used in the following reactions:} \] \[ (i)\;\text{Oxidation of a primary alcohol to aldehyde} \] \[ (ii)\;\text{Oxidation of a primary alcohol to carboxylic acid} \] \[ (b)\;\text{Write the reaction involved in Kolbe's reaction.} \] \[ (c)(i)\;\text{Why are tertiary alcohols resistant to oxidation?} \] OR \[ (c)(ii)\;\text{Write the products of the following reaction:} \] \[ (CH_3)_3C-O-C_2H_5 \xrightarrow{HI} \]