Q26 / 62 · NTA Abhyas (JEE Main) 2020 · Chemistry · Haloalkanes and Haloarenes

The alcoholic solution of KOH is used in which type of the organic reactions?

  • A
    Decarboxylation
  • B
    Dehydrogenation
  • Correct answer
    C
    Dehydrohalogenation
  • D
    Dehydration

Solution

CH3CH2Br+alcKOH→dehydrohalogenationCH2=CH2+KBr+H2O

In alcoholic KOH alkoxide ions RO- are present which is a strong base. They abstract proton from beta carbon of alkyl halide and favours elimination reaction

ROH+KOH→ROK+H2O

ROK→RO-+K+

RO-+H-CH2β-CH2α-Br→ROH+CH2=CH2+Br-

Hence, the correct answer is option: 'C'.

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