MCQ
Transition element makes complex compound due to
- APresence of empty $d-$ orbital
- Blarge size
- CVariable valency
- Dpresence of $2e^-$ in outer shell
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(image) $\mathop {\xrightarrow{{CHC{l_3}/KOH}}}\limits_{heat} $ Intermediate $\mathop {\xrightarrow{{HCl}}}\limits_{300\,K} $ $X$

Assertion $A$: Helium is used to dilute oxygen in diving apparatus.
Reason $R:$ Helium has high solubility in $O _2$.
In the light of the above statements, choose the correct answer from the options given below