In compounds type \( \mathrm{E} \mathrm{Cl}_{3} \), where \( \mathr...

In compounds type \( \mathrm{E} \mathrm{Cl}_{3} \), where \( \mathrm{E}=\mathrm{B}, \mathrm{P}, \mathrm{As} \) or \( \mathrm{Bi} \), the angles \( \mathrm{Cl}-\mathrm{E}-\mathrm{Cl} \) for different \( \mathrm{E} \) are in the order
(1) \( BP=A s=B i \)
(2) \( BPA sB i \)
(3) \( \mathrm{B}\mathrm{P}=\mathrm{As}=\mathrm{Bi} \)
(4) \( \mathrm{B}\mathrm{P}\mathrm{As}\mathrm{Bi} \)