Which of the most suitable reagent for the conversion of R-CH2OH -->RCHO?
Correct answer: B. Pyridinium chlorochromate
- A. KMnO4/NaOH
- B. Pyridinium chlorochromate
- C. CrO3
- D. Cr2O4/H2SO4 (Conc.)
Explanation
RCH2OH→RCHO its an oxidation reaction. Pyridinium chlorochromate is amild oxidising agent that oxidises primary alcohol to aldehydes and secondary alcohols to ketones. It does not effect any other functional group and therefore have high selectivity for oxidation of alcohols. Whereas acidic permanganate, acidic dichromate, chromic anhydride in glacial acetic acid are strong oxidising agents and can do further oxidation to carboxylic acid. The most suitable reagent for RCH2OH→RCHO is pyridinium chlorochromate (PCC)
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About Alcohols and Phenols
Alcohols are classified as primary, secondary or tertiary and studied through their hydrogen bonding, acidity, oxidation and reactions with active metals, acids and halogenating agents. Phenols require separate treatment because the hydroxyl group is attached to an aromatic ring, making their acidity and electrophilic substitution different from ordinary alcohols.
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