The following are some statements related to VA group hydrides,
I. Reducing proeprty increases from `NH_(3)` to `BiH_(3)`
II. Tendency to donate lone pair decreases from `NH_(3)` to `BiH_(3)`.
III. Thermal stability of hydrides decreases from `NH_(3)` to `BiH_(3)`.
IV. bond angle of hydrides decreases from `NH_(3)` to `BiH_(3)`.

Options

A. I,II,III and IV
B. I, III and IV
C. I, II and IV
D. I and IV

Answer

A

Explanation

Reducing property of the hybrides:
(i) `NH_(3) lt PH_(3) lt AsH_(3) lt SbH_(3) lt BiH_(3)`
Basic strength:
(ii) `NH_(3) gt PH_(3) gt AsH_(3) gt SbH_(3) gt BiH_(3)`
Thermal stability:
(iii) `NH_(3) gt PH_(3) gt AsH_(3) gt SbH_(3) gt BiH_(3)`
Bond angle:
(i) `NH_(3) gt PH_(3) gt AsH_(3) gt SbH_(3) gt BiH_(3)`.