A Transuclent white waxy solid A on heating in an inert atmosphere is converted into allotrophic form B allotrope A on reaction with very dilute aquaeous NaOH liberates highly poisonous gas C have a fish rotten smell the substance A reacts with excess of chlorine to form D which hydrolysis to form compund E . Identify A and E also write the reactions involved 

Asked by niharikapabba2605 | 7th Aug, 2018, 11:47: AM

Expert Answer:

Solid A is white phosphorous, P4.  

On heating white phosphorous converts into red phosphorous.

White phosphorous on heating with alkali NaOH forms phosphorous sodium hypophosphite and phosphine gas.

Phosphine gas is a colourless and is highly poisonous gas.

P4 + 3NaOH +3H2O → PH3 + 3NaH2PO2

White phosphorus reacts with the excess of chlorine to form phosphorous pentachloride.

P4 + 10Cl2 → 4PCl5

Phosphorous pentachloride is hydrolysed to form POCl3 which on further hydrolysis gives H3PO4.

PCl5 + H2O → POCl3 + 2HCl

POCl3 + H2O → H3PO4 + 3HCl

A = White phosphorus (P4)

B = Red phosphorus

C =Phosphine (PH3)

D =PCl5 

E =H3PO4

 

Answered by Varsha | 7th Aug, 2018, 03:42: PM