Why is it necessary to distill aldehyde formed from oxidation of primary alcohol through acidified potassium dichromate (VI) solution or acidified sodium dichromate (VI) solution?
Correct answer: A. Aldehyde formed may be oxidized further to carboxylic acid concerned
- A. Aldehyde formed may be oxidized further to carboxylic acid concerned
- B. Aldehyde formed is unstable and decompose back to original precursor i.e. primary alcohol
- C. Aldehyde may be oxidised further to a ketone
- D. Aldehyde formed may react with primary alcohol, the original reactant.
Explanation
Aldehyde formed may be oxidized further to carboxylic acid Primary alcohols oxidized with acidified K2 Cr2O7/Na2Cr2O7 can form aldehydes. Aldehydes are easily further oxidized to carboxylic acids in the same reaction mixture. Distillation removes the aldehyde immediately, preventing over- oxidation.
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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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