The p-Block Elements

The p-Block Elements

Question

The molecule having smallest bond angle is

  • NCl3

  • AsCl3

  • SbCl3

  • PCl3

Answer

C.

SbCl3

On moving down the group, the size of the central atom increases and electronegativity decreases. Thus, the bond pairs of electrons tend to lie farther away from the central atoms as we move from N to Sb. Hence, bond pairs repulsion is maximum in NCl3 and minimum in SbCl3. Thus, bond angle decreases from NCl3 (maximum)to SbCl3 (minimum).

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