MCQ
Possible alkyl radicals formed by $C _4 H _9$ is :
- A2
- B3
- ✓4
- D5
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Assertion $(A):$ The ionic radii of $O ^{2-}$ and $Mg ^{2+}$ are same.
Reason $( R )$ : Both $O ^{2-}$ and $Mg ^{2+}$ are isoelectronic species.
In the light of the above statements, choose the correct answer from the options given below