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Which of the following orders is correct...

Which of the following orders is correct?
(1) `SbH_(3)gt NH_(3) gt AsH_(3) gt PH_(3)-" Boiling Point"`
(2) `NH_(3) gt PH_(3) gt AsH_(3) gt SbH_(3)-" Thermal Stability"`
(3) `NH_(3) gt PH_(3) gt AsH_(3) gt SbH_(3) - "Basic Character"`
(4) `NH_(3) gt PH_(3) gt AsH_(3) gt SbH_(3)- "Bond Angle"`

A

(1),(2) and (3) only

B

(2),(3) and (4) only

C

(1),(3) and (4) only

D

(1),(2),(3) and (4)

Text Solution

Verified by Experts

The correct Answer is:
D
(1)`NH_3` has higher boiling point than `AsH_3 and PH_3` on account of H-bonding.`SbH_3` has highest boiling point on account of highest molecular weight.
(2)As the size of element increases , the strength of M-H bond decreases and thus stability decreases.
(3)Basic decreases down the group . (Drago rule)
(4)HEH angle `(.^@):NH_3`=107.8, `PH_3=93.6, AsH_3=91.8, SbH_3=91.3`
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