Question

In compounds of type ECl₃, where E = B, P, As or Bi, the
angles Cl - E- Cl for different E are in the order.
(a) B > P = As = Bi (b) B > P > As > Bi
(c) B < P = As = Bi (d) B < P < As < Bi

Answer 1

B > P > As > Bi is the trend.

• Explanation:

• The bond angle is directly proportional to the hybridization of the central atom.

• Here in case of BCl3, the absence of lone pair makes the hybridization to be sp2.

• In case of rest of the elements, all the hybridization is sp3, due to presence of lone pair.

• But there's an electronegativity among the elements.

• The difference in electronegativity gives effect on bond angles.

• As the electronegativity decrease, the bond angle increase.

• So, the bond angle trend comes as B > P > As > Bi.

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Answer 2

Explanation:

In compounds of type ECl₃, where E = B, P, As or Bi, the

angles Cl - E- Cl for different E are in the order.

(a) B > P = As = Bi (b) B > P > As > Bi

(c) B < P = As = Bi (d) B < P < As < Bi