MCQ
Correct order of rate of $EAS$ (electrophilic aromatic substitution) is


- A$c > b > a > d$
- B$c > d > a > b$
- C$a > b > c > d$
- ✓$c > d > b > a$

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Reason : Iodide stabilizes higher oxidation state
$C(s) + O_2(g) \to CO_2(g) + x\ kJ$
$CO(g) + \frac {1}{2}O_2(g) \to CO_2(g) + y\,kJ$
The heat of formation of $CO(g)$ is
Statement $(I)$ : The $4 \mathrm{f}$ and $5 \mathrm{f}$ - series of elements are placed separately in the Periodic table to preserve the principle of classification.
Statement $(II)$ :$S$-block elements can be found in pure form in nature. In the light of the above statements, choose the most appropriate answer from the options given below :