p-Block Elements-I - Result Question 10

####10. In compounds of type ECl3, where E=B,P,As or Bi, the angles ClECl for different E are in the order

(1999, 2M)

(a) B>P=As=Bi

(b) B>P>As>Bi

(c) B<P=As=Bi

(d) B < P < As < Bi

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Answer:

Correct Answer: 10. (b)

Solution:

  1. In BCl3, bond angle =120.

In PCl3,AsCl3 and BiCl3, central atom is sp3 hybridised. Since P,As and Bi are from the same group, bond angle decreases down the group. Hence, overall order of bond angle is :

B>P>As>Bi



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