MCQ
Jahn-Teller effect is not observed in high spin complexes of
- A$d^7$
- ✓$d^8$
- C$d^4$
- D$d^9$

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$\begin{array}{*{20}{c}}
{C{H_3} - C \equiv C - C{H_2} - \mathop C\limits_{\mathop {||}\limits_O } - Cl}
\end{array} \ \xrightarrow[{BaS{O_4}}]{{{H_2} - Pd}}$