MCQ
Which of the following compound will react with ethanolic $KCN$
- AEthane
- BAcetyl chloride
- CChlorobenzene
- ✓Benzaldehyde

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$(I)\,[Cr(NO_3)_3(NH_3)_3]$ $(II)\, K_3[Fe(C_2O_4)_3]$ $(III)\,[CoCl_2(en)_2]^+$ $(IV)\, [CoBrCl(ox)_2]^{3-}$

