Question
The unit representing atomic radii and ionic radii is
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$A$. $\mathrm{Be} \rightarrow \mathrm{Be}^{-}$
$B$. $\mathrm{N} \rightarrow \mathrm{N}^{-}$
$C$. $\mathrm{O} \rightarrow \mathrm{O}^{2-}$
$D$. $\mathrm{Na} \rightarrow \mathrm{Na}^{-}$
$E$. $\mathrm{Al} \rightarrow \mathrm{Al}^{-}$
Choose the most appropriate answer from the options given below :

which of the following alkyne cannot give ketone
| List$-I$ | List$-II$ |
| $(a)$ $\left[ Co \left( NH _{3}\right)_{6}\right]\left[ Cr ( CN )_{6}\right]$ |
$(i)$ Linkage isomerism |
| $(b)$ $\left[ Co \left( NH _{3}\right)_{3}\left( NO _{2}\right)_{3}\right]$ |
$(ii)$Solvate isomerism |
| $(c)$ $\left[ Cr \left( H _{2} O \right)_{6}\right] Cl _{3}$ |
$(iii)$ Co-ordination isomerism |
| $(c)$ $cis-[CrCl$ $\left._{2}(\text { ox })_{2}\right]^{3-}$ | $(iv)$ Optical isomerism |
Choose the correct answer from the options given below: