Q.

Bond angles of  NH3,PH3,AsH3andSbH3  are in the order

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a

SbH3>AsH3>NH3>PH3

b

PH3>AsH3>SbH3>NH3

c

NH3>PH3>AsH3>SbH3

d

SbH3>AsH3>PH3>NH3

answer is D.

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Detailed Solution

Bond angle
 Question Image
On moving down the group, the electro negativity of the central atom decreases. N being more  electronegative will attract the shared pair of electrons towards itself thus bp-bp repulsion  increases. Hence bond angle increases.
 

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