MCQ
In $[Cr(C_2O_4)_3]^{2-} ,$ the isomerism shown is :-
- Aligand
- ✓optical
- Cgeometrical
- Dionisation

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$C{H_3}COOH + PC{l_5} \to A\mathop {\xrightarrow{{{C_6}{H_6}}}}\limits_{anh.\,AlC{l_3}} $ $B\mathop {\xrightarrow{{{C_2}{H_5}MgBr}}}\limits_{ether} C$