First slide
13th group or boron group
Question

The compounds of type ECl3 where E=B,P,AS(or) Bi the angles Cl-E-Cl for different E are in the order.

Moderate
Solution

 1) In BCl3 Boron undergoes sp2 Hybridization 120

 2) In PCl3,AsCl3&BiCl3 the central atom undergoes sp3 and one lone pair. 

Hence the 
bond angles< 109°281

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