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AP EAMCET201923 Apr 2019Morning ShiftChemistryAlcohols Phenols and EthersActual

What are (X, Y, Z ) in the following reactions? ( CH ₃- CH ₂- OH Y CH ₂= CH ₂+ H ₂ O )

Options

  1. A( array |c|c|c| X & Y & Z H ₂ SO ₄, 443 ~K & array l 85 % H ₃ PO ₄ 440 ~K array & array l 20 % H ₃ PO ₄, 358 ~
  2. B( array |c|c|c| X & Y & Z array l 85 % H ₃ PO ₄ 440 ~K array & H ₂ SO ₄, 443 ~K & array l 20 % H ₃ PO ₄ 358 ~K
  3. C( array |c|c|c| X & Y & Z array l 20 % H ₃ PO ₄, 358 ~K array & H ₂ SO ₄, 443 ~K & array l 85 % H ₃ PO ₄, 440
  4. D( array |c|c|c| X & Y & Z H ₂ SO ₄, 443 ~K & array l 20 % H ₃ PO ₄, 358 ~K array & array l 85 % H ₃ PO ₄ , 440

Correct answer

B. ( array |c|c|c| X & Y & Z array l 85 % H ₃ PO ₄ 440 ~K array & H ₂ SO ₄, 443 ~K & array l 20 % H ₃ PO ₄ 358 ~K

Step-by-step solution

These reactions are known as dehydration reactions where ( H ₃ PO ₄ ) and ( H ₂ SO ₄ ) are dehydrating agents. Ethanol undergo dehydration by heating with conc. ( H ₂ SO ₄ ) at (443 ~K ) whereas (2^ ) alcohols by (85 % H ₃ PO ₄ ) at (440 ~K ) and (3^ ) alcohols by (20 % H ₃ PO ₄ ) at (358 ~K ).

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