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JIPMER2019ChemistryHaloalkanes and Haloarenes

Which of the following is not correct?

Options

  1. APhCH ₂ Br PhCHBrCH Ph ₃ PhCBr ( CH ₃ )₂ ( ~S _ N 1 )
  2. BR - I R - Br R - Cl ( S _N 2 )
  3. Carray r CH ₂= CH - Cl CH ₂= CH - CH ₂- Cl PhCH ₂- Cl ( S ₂ 1 ) array
  4. DR - Cl R - Br R - l ( S _ N 1 )

Correct answer

A. PhCH ₂ Br PhCHBrCH Ph ₃ PhCBr ( CH ₃ )₂ ( ~S _ N 1 )

Step-by-step solution

Key Idea In S _ N 1 reactions, carbocations are the intermediates. Greater the stability of carbocation more easily it is formed and hence, faster will be the rate of reaction. The stability of carbocation decreases in the order. 3^ carbocation 2^ carbocation 1^ carbocation. Thus, option (a) is incorrect while trends in other options are correct.

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