Three allotropes (A), (B) and (C) of phosphorous in the following changes are respectively

$A\underset{1200 \mathrm{atm}}{\stackrel{473\mathrm{K}}{⟶}}B$

A$\underset{{\mathit{CO}}_{\mathit{2}}\mathit{\text{-atm }}}{\overset{\mathit{573}\mathit{K}\mathit{ }\mathit{C}}{\mathit{\to }}}$

White phosphorous at 143 kelvin and 1200 atmospheric pressure converted into the beta black phosphorous and on the other hand White phosphorous at 573 K and passes with the carbon di oxide red phosphorous is found.