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Q.1 A translucent white waxy solid (A) on heating in an inert atmosphere is converted to its allotropic form (B). Allotrope (A) on reaction with very dilute aqueous KOH liberates a highly poisonous gas (C) having rotten fish smell. With excess of chlorine forms (D) which hydrolyses to compound (E). Identify compounds (C), (D) and (E). Give brief explanation for your answers.

(3 Marks)

sRE

Make the ques clear. Plz specify whether A reacts with excess Cl or C (I suppos it to be A)

White phosphorus is a translucent white waxy solid, therefore A is white phosphorus.
Red phosphorus is obtained by heating white phosphorus at 573K
in an inert atmosphere for several days. Therefore B is red phosphorus.
P4 + 3KOH + 3H2O ----> PH3 + KH2PO2. Therefore C is PH3.
P4 + 10Cl2 ------> 4PCl5. Therefore D is PCl5.
PCl5 + H2O ------> POCl3 + 2HCl. Therefore E is POCl3.

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