A translucent waxy solid (A) on heating in an inert atmosphere is converted to its allotropic from (B). Allotrope (A) on reaction with very dilute aqueous KOH liberates highly poisonous gas (C) having rotten fish smell. With excess of chlorine forms (D) which hydrolyses to compound (E).
Identify compound (A) to (E)
Or
Concentrated sulphuric acid is added followed by heating to each of the following test tube labelled (i) to (v).
Identify in which of the above test tube the following change will be observed. Support your answer with the help of a chemical equation.
(a) Formation of black substance
(b) Evolution of brown gas
(c) Evolution of colourless gas
(d) Formation of brown substance which on dilution becomes blue.
(e) Disapperance of yellow powder along with evolution of colourless gas.
A is white phosphorus.
B is red phosphorus.
C is phosphine
D is phosphorus trichloride
E is phosphorus acid.
OR
(a) In test (i), there will be observed.
(b) In test (iii), there will be evolution of brown gas
(c) In test tube (v), there will be evolution of colourless gas
(d) In test tube (d), there will be formation of brown substance which on dilution becomes blue.
(e) In test tube (iv), there will be disappearance of yellow powder along with evolution of colourless gas.
