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A translucent white waxy solid (A) on he...

A translucent white waxy solid `(A)` on heating in an inert atmosphere is converted into its allotropic form `(B).(A)` on reaction with very dilute `KOH` liberates a highly poisonous gas `( C)`, having rotten smell. With excess of chlorine, `( C)` forms `(A)` which hydrolyses to compound `(E)`. Indentify `(A)` to `(E )`.

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`(A) underset ("Inert atmosphere") overset (Heat) rarr (B)`
`(A) and (B)` allotropes.
`(A) + KOH rarr underset ("Poisonous gas will rotten smell")((C))`
`(C) + Cl_2("Express") rarr (D) overset("Hydrolysis")rarr (E)`
Since `(A)` on heating converts into `(B), (A)` is white phosphorous and `(B)` is red phosphorous.
`underset ("White") (P_4) rarr underset ("Red") (P_4)`
`underset ("White") (P_4) + 3 KOH + 3 H_2 overset (Delta) rarr underset("Potassium hypophosp hite")(3 KH_2 PO_2) + underset ("Phosphine")(PH_3)`
Phosphine `( C)` is highly poisonous gas.
`PH_3 + 4 Cl_2 rarr underset ((D)) (PCl_5) + 3 HCl`
`(D)` is phosphorous pentachloride.
`PCl_5 + 4H_2 O rarr underset (( E)) (H_3 PO_4) + 5 HCl`
`(E)` is phosphorous acid.
Hence `(A)` is white phosphorous, `(B)` is red phosphours, `( C)`is phosphine, `(D)` is phosphorous pentachloride, `(E)` is phosphoric acid.
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