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Asked in PMC Practice Test 23 (2021) 2021

Tertiary alcohols can change into alkenes by

Correct answer: C. Elimination reaction

  • A. Combustion reaction
  • B. Oxidation
  • C. Elimination reaction
  • D. Addition reaction

Explanation

Tertiary alcohols undergo dehydration/elimination reaction to form alkenes under specific conditions i.e., heat + concentrated sulphuric acid, hot alumina. When tertiary alcohol reacts with acidic KMnO4, first elimination takes place and alcohol is converted into alkenes which are then further oxidised.

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About Elimination Reactions

Elimination reactions remove a leaving group and a hydrogen atom from adjacent carbon atoms to form an alkene. The topic covers dehydrohalogenation of alkyl halides, E1 and E2 mechanisms, the role of base, solvent and substrate structure, and Zaitsev orientation, which is often contrasted with substitution.

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