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ChemistryNEET 2024Preparation and reactions of alcohols

Alcohols, Phenols and Ethers

The products A and B obtained in the following reactions, respectively, are:

3ROH+PCl3→3RCl+A\mathrm{3ROH + PCl_3 \rightarrow 3RCl + A}

ROH+PCl5→RCl+HCl+B\mathrm{ROH + PCl_5 \rightarrow RCl + HCl + B}

  1. A.POCl3\mathrm{POCl_3} and H3PO4\mathrm{H_3PO_4}
  2. B.H3PO4\mathrm{H_3PO_4} and POCl3\mathrm{POCl_3}
  3. C.H3PO3\mathrm{H_3PO_3} and POCl3\mathrm{POCl_3}✓
  4. D.POCl3\mathrm{POCl_3} and H3PO3\mathrm{H_3PO_3}

Solution

PCl3\mathrm{PCl_3} with an alcohol gives the alkyl chloride and phosphorous acid H3PO3\mathrm{H_3PO_3}; PCl5\mathrm{PCl_5} gives the alkyl chloride, HCl and phosphoryl chloride POCl3\mathrm{POCl_3}.

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