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Alcohols, Phenols, and Ethers — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistryAlcohols, Phenols, and Ethers1 Mark
MCQ
Energy profile diagram for dehydration of 2-butanol using conc.H2​SO4​ is given below.

Product (b) of above reaction is:

  • A
    1-butene
  • B
    cis-2-butene
  • C
    trans-2-butene
  • D
    iso-butene
✓

Answer

  1. cis-2-butene

Explanation:

From energy profile Me−CH2​−CH−CH3​ has the least energy while means it is most stable molecule. Hence, dehydration of 2-Butanol forms Me−CH2​−CH​CH3​ which on dehydrogenation gives Me−CH=Ch−CH3​ (A is molecule)

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