MCQ
Which is the most explosive
- ✓$NC{l_3}$
- B$PC{l_3}$
- C$AsC{l_3}$
- DAll of these
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$C{H_3} - C{H_2} - Br\xrightarrow{{{\text{alc}}{\text{.KCN}}}}$ $C{H_3}C{H_2}CN$$\xrightarrow{{{\text{HOH}}}}X$

According the Werner's theory.
$(1)$ Ligands are connected to the metal ions by covalent bonds.
$(2)$ Secondary valencies have directional properties
$(3)$ Secondary valencies are non-ionisable
Of these statements :