Alcohols, Phenols and Ethers — Class 12 Chemistry PYQs

Which of the following compounds will give a ketone on oxidation with chromic anhydride (CrO₃) ?
(A) (CH₃)₂CH – CH₂OH
(B) CH₃CH₂CH₂OH
(C) (CH₃)₃C – OH
(D) CH₃ – CH₂ – CH(OH) – CH₃

Which of the following is most acidic ?
(A) Benzyl alcohol
(B) Phenol
(C) Cyclohexanol
(D) p-Chlorophenol

Phenol is less acidic than :
(A) ethanol
(B) o-nitrophenol
(C) o-methoxyphenol
(D) o-methylphenol

(CH₃)₃ C – O – CH₃ reacts with HI to give :
(A) (CH₃)₃ C – I + CH₃OH
(B) (CH₃)₃ C – I + CH₃ – I
(C) (CH₃)₃ C – OH + CH₃ – I
(D) (CH₃)₃ C – OH + CH₃OH

(CH₃)₂ CH – O – CH₃ reacts with HI to give :
(A) (CH₃)₂CH – OH + CH₃ – OH
(B) (CH₃)₂CH – OH + CH₃ – I
(C) (CH₃)₂CH – I + CH₃ – OH
(D) (CH₃)₂CH – I + CH₃ – I

Anisole reacts with HI to give :
(A) Phenol + CH₃ – I
(B) Iodobenzene + CH₃ – OH
(C) Benzyl alcohol + CH₃ – I
(D) Benzyl iodide + CH₃ – OH

A compound (X) with the molecular formula C₃H₈O can be oxidized by strong oxidizing agents to another compound (Y) whose molecular formula is C₃H₆O₂. The compound (X) is :
(A) CH₃ – CH₂ – O – CH₃
(B) CH₃ – CH(OH) – CH₃
(C) CH₃ – CH₂ – CH₂ – OH
(D) None of the above

Ethanol on heating with conc. H₂SO₄ at 413 K gives :
(A) C₂H₅OSO₃H
(B) C₂H₅ – O – CH₃
(C) C₂H₅ – O – C₂H₅
(D) CH₂ = CH₂

Aspirin is formed by the acetylation of :
(A) Benzoic acid
(B) Phenol
(C) Salicylic acid
(D) Phthalic acid

Dehydration of tertiary alcohols with Cu at 573 K gives :
(A) Alkyne
(B) Alkene
(C) Aldehyde
(D) Ketone