Hydrolysis of $\mathrm{PCl}_3$ in the presence of moisture gives the compound $\mathbf{X}$ along with fumes of HCl . On heating, $\mathbf{X}$ disproportionates to give compound $\mathbf{Y}$ and phosphine. On heating, $\mathbf{Y}$ gives compound $\mathbf{Z}$ and water. The correct statement is

• A

  The oxidation states of phosphorus in $\mathbf{X}, \mathbf{Y}$ and $\mathbf{Z}$ are $+3,+4$ and +5 , respectively
• Correct answer
  B

  $\text { The geometry around phosphorus in } \mathbf{X}, \mathbf{Y} \text { and } \mathbf{Z} \text { is tetrahedral. }$
• C

  $\text { Among } \mathbf{X}, \mathbf{Y} \text { and } \mathbf{Z} \text {, the compounds } \mathbf{Y} \text { and } \mathbf{Z} \text { are reducing agents. }$
• D

  $\text { The basicities of } \mathbf{X} \text { and } \mathbf{Y} \text { are same. }$

Hence, the correct answer is option: 'B'.