MCQ
Which of the following is spin-free complex?
- ✓$[Fe(H_2O)_6] Cl_2$
- B$K_4[Fe(CN)_6$
- C$[Ni(CO)_4]$
- D$[Ni(CN)_4]^{2-}$

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$CH_3 -C\equiv C-H$ $\xrightarrow{{C{H_3}MgBr}}$ $CH_4+(A)$ $\mathop {\xrightarrow{{(i)\,C{O_2}}}}\limits_{(ii)\,{H_2}O/{H^ \oplus }} $ $(B)$
$(B)$ will be :
(Molal depression constant for water is $1.80\, K\, kg\,mol ^{-1}$ and molar mass of $KCl$ is $74.6 \,g\, mol ^{-1}$ )