- A$[Ne]3{d^{1 - 10}},4{s^2}$
- B$[Ar]3{d^{1 - 10}},4{s^{1 - 2}}$
- ✓$[Kr]4{d^{1 - 10}},\,\,5{s^{1 - 2}}$
- D$[Xe]5{d^{1 - 10}},\,\,5{s^{1 - 2}}$
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Correct order of $pK _{ a }$ value is:


$ClF _{3}, IF _{7}, BrF _{5}, BrF _{3}, I _{2} Cl _{6}, IF _{5}, ClF , ClF _{5}$
$(A)$ The stronger the temperature dependence of the rate constant, the higher is the activation energy.
$(B)$ If a reaction has zero activation energy, its rate is independent of temperature.
$(C)$ The stronger the temperature dependence of the rate constant, the smaller is the activation energy.
$(D)$ If there is no correlation between the temperature and the rate constant then it means that the reaction has negative activation energy.
Assertion $(A)$ : Haloalkanes react with $\mathrm{KCN}$ to form alkyl cyanides as a main product while with $\mathrm{AgCN}$ form isocyanide as the main product.
Reason $(R)$ : $\mathrm{KCN}$ and $\mathrm{AgCN}$ both are highly ionic compounds.
In the light of the above statement, choose the most appropriate answer from the options given below: