Choose the alcohol which on oxidation with chromic anhydride will give a ketone.
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) →
Oxidation with chromic anhydride:
Primary alcohol → Aldehyde → Acid
Secondary alcohol → Ketone
Tertiary alcohol → No oxidation
Detailed Explanation
Option 1: Phenol
Phenols do not undergo normal oxidation to ketones with chromic anhydride. They typically form quinones or undergo ring oxidation.
Option 2: Benzyl alcohol
Benzyl alcohol is a primary alcohol. On oxidation with chromic anhydride, it forms benzaldehyde or further oxidizes to benzoic acid.
Option 3: Cyclohexanol
Cyclohexanol is a secondary alcohol. Secondary alcohols oxidize to ketones.
Cyclohexanol $\rightarrow$ Cyclohexanone
Option 4: Cyclohexylmethanol
This is a primary alcohol and will oxidize to aldehyde and then acid, not ketone.