Which of the following alcohol does not get oxidized when it reacts with K₂Cr₂O₇/H₂SO₄?
Correct answer: A. CH₃C(CH₃)₂OH
- A. CH₃C(CH₃)₂OH
- B. CH₃CH(CH₃)OH
- C. CH₃OH
- D. C₂H₅OH
Explanation
Option A is a tertiary alcohol which cannot be oxidized with K2Cr2O7 as the central carbon atom has no free hydrogens.Option B is a secondary alcohol which oxidizes to a ketone. Option C is methanol which oxidizes to carbondioxide. Option D is ethanol which oxidizes to ethanal first then ethanoic acid.
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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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