MCQ
Which of the following compound expected to be colourless
- A$ScO$
- B${V_2}{O_3}$
- ✓$CuCN$
- D$C{r_2}{(S{O_4})_3}$

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The observed pattern of electrophilic substitution can be explained by
$(A)$ the steric effect of the halogen
$(B)$ the steric effect of the tert-butyl group
$(C)$ the electronic effect of the phenolic group
$(D)$ the electronic effect of the tert-butyl group
