MCQ
If coordinate $'X'$ is atomic number then select best for $'Y'$ coordinate


- A$IE_1$
- BElectron affinity
- C$Z_{eff}$ (using slater rule)
- ✓$\frac {1}{electronegativity}$

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$\begin{array}{*{20}{c}}
{R = - CH - Cl}\\
{|\,\,}\\
{\,\,\,\,C{H_3}}
\end{array}\,\,\,\,,\,\,\,\,\,\,\,\,\,\,\begin{array}{*{20}{c}}
{S = - CH - Cl}\\
{|\,\,}\\
{Br}
\end{array}$
The number of compounds/species which obey Huckel's rule is $..........$