Molybdenum compounds are used in

List-$I$	List-$II$
$\mathrm{P}_2 \mathrm{O}_3+3 \mathrm{H}_2 \mathrm{O} \rightarrow$	$\mathrm{P}(\mathrm{O})\left(\mathrm{OCH}_3\right) \mathrm{Cl}_2$
$\mathrm{P}_4+3 \mathrm{NaOH}+3 \mathrm{H}_2 \mathrm{O} \rightarrow$	$\mathrm{H}_3 \mathrm{PO}_3$
$\mathrm{PCl}_5+\mathrm{CH}_3 \mathrm{COOH} \rightarrow$	$\mathrm{PH}_3$
$\mathrm{H}_3 \mathrm{PO}_2+2 \mathrm{H}_2 \mathrm{O}+4 \mathrm{AgNO}_3 \rightarrow$	$\mathrm{H}_3 \mathrm{PO}_4$

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The correct decreasing order of $SN^2$ reactivity of following alkyl halide is

$\mathop {C{H_2} = CH - Br}\limits_{(I)} $ $\mathop {{\text{C}}{{\text{H}}_3} - Br}\limits_{\left( {II} \right)} $ $\mathop {\begin{array}{*{20}{c}}
{C{H_3} - CH - Br} \\
{|\,\,} \\
{\,\,\,C{H_3}}
\end{array}}\limits_{\left( {III} \right)} $ $\mathop {C{H_3}C{H_2}Br}\limits_{\left( {IV} \right)} $

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Glycosidic linkage between $C _{1}$ of $\alpha$-glucose and $C _{2}$ of $\beta$-fructose is found in.

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Which of the following reaction is possible at anode

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For a first order reaction $A \rightarrow B$, the rate constant, $k =5.5 \times 10^{-14} \,s ^{-1}$. The time required for $67\, \%$ completion of reaction is $x \,\times 10^{-1}$ times the half life of reaction. The value of $x$ is $....$ (Nearest integer)

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What is the final product $(B)$ of this sequence ?