Which of following is phenolic

$(A)$ For the reaction, $M (s)+2 H ^{+}(a q) \rightarrow H _2(g)+ M ^{2+}(a q)$, if $\frac{ dE _{c o l l}}{ dT }=\frac{ R }{ F }$, then the entropy change of the reaction is $R$ (assume that entropy and internal energy changes are temperature independent).

$(B)$ The cell reaction, $Pt (s) \mid H _2(g, 1$ bar $)\left| H ^{+}(a q, 0.01 M ) \| H ^{+}(a q, 0.1 M )\right| H _2(g, 1 bar ) \mid Pt (s)$, is an entropy driven process.

$(C)$ For racemization of an optically active compound, $\Delta S >0$.

$(D)$ $\Delta S >0$, for $\left[ Ni \left( H _2 O \right)_6\right]^{2+}+3$ en $\rightarrow\left[ Ni ( en )_3\right]^{2+}+6 H _2 O$ (where en $=$ ethylenediamine).

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Ferrosilicon is used in steel industry as

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For a reaction $2A + B \to $ Products, doubling the initial concentration of both the reactants increases the rate by a factor of $8$, and doubling the concentration of $+B$ alone doubles the rate. The rate law for the reaction is

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Which of the following substituted phenols is the strongest acid?

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For the gaseous reactions Calculate the approxmate value of temperature at which $k_1 = k_2$ . $[ln\, 10 = 2.3]$ ......... $K$

$A \to B$ ${K_1} = {10^{15}}{e^{ - 25000/8.314\,T}}$

$C \to D$ ${K_2} = {10^{14}}{e^{ - 15000/8.314\,T}}$

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A distinct domain in an enzyme molecule may: