X is a compound that do not react with Na metal but produces carboxylic acid when heated under reflux with acidified potassium dichromate?
Correct answer: A. Propanal
- A. Propanal
- B. Propanone
- C. Propan-1-ol
- D. Propan-2-ol
Explanation
The correct answer is Propanal because it is an aldehyde that does not react with sodium metal and can be oxidized to propanoic acid when treated with potassium dichromate under acidic conditions. The other options do not satisfy the criteria given in the question:Propanone (Option B) is a ketone that does not oxidize to a carboxylic acid under the specified conditions, so it is incorrect.Propan-1-ol (Option C) is a primary alcohol that reacts with sodium metal, thus failing the first condition of the question.Propan-2-ol (Option D) is a secondary alcohol that also reacts with sodium metal, making it unsuitable as well.Thus, only Propanal correctly fits both criteria of the question.
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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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