Q30 / 90 · JEE Main 2017 (02 Apr) · Chemistry

Which of the following, upon treatment with tert-BuONa  followed by addition of bromine water, fails to decolourize the colour of bromine?

  • A
    Figure
  • B
    Figure
  • C
    Figure
  • Correct answer
    D
    Figure

Solution

In the options, they have acidic β−H so an elimination reaction takes place and alkene will be formed.

And the formed alkene decolourizes the bromine water {E⊕ addition reaction of an alkene by HOBr} while in 4 it does not have β−H so, there is no formation of alkene, hence does not decolourize Br2 water.

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

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