MCQ
The ethylene molecule have :
- A$4 \sigma$ and $4 \pi$ bond
- B$5 \sigma$ and $3 \pi$ bond
- ✓$5 \sigma$ and $1 \pi$ bond
- D$5 \sigma$ and $2 \pi$ bond
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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
How many structural isomers are possible when one of the hydrogens is replaced by a chlorine atom?

$\begin{array}{*{20}{c}} A \\ {{\text{(simplest optically active alkene)}}} \end{array}\,\xrightarrow[{(ii)\,{X_2}/\Delta }]{{(i)\,{H_2}/Ni/\Delta }}$