c All the members form volatile halides of the type $A X_{3} .$ All halides are pyramidal in shape. The bond angle decreases on moving down the group due to decrease in bond pair-bond pair repulsion.
$\begin{array}{ccc}{N C L_{3}} & {P C l_{3}} & {A s C l^{3}} \\ {107^{o}} & {94^{o}} & {92^{o}}\end{array}$
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