List of top Chemistry Questions on Alcohols, Phenols And Ethers asked in UP Board XII

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?

Write the structures of (A), (B), and (C) in the following reaction:
Reaction Scheme: \[ (C) \xleftarrow{\text{conc. } HNO_3} \text{Phenol} \xrightarrow{\text{dil. } HNO_3} (A) + (B) \]