DNA multiplication is called

Reason $R$ : Phenols react with halogen acids violently. In the light of the above statements, choose the most appropriate from the options given below:

→

$\underset{(A)}{\mathop{\begin{matrix}
\,\,\,\,\,Ph\,\,\,\,C{{H}_{3}} \\
|\,\,\,\,\,\,\,\,\,\,|\,\, \\
Ph-C-C-C{{H}_{3}} \\
|\,\,\,\,\,\,\,\,\,\,|\,\,\, \\
\,OH\,\,\,OH \\
\end{matrix}}}\,+\underset{(B)}{\mathop{\begin{matrix}
\,\,\,\,Ph\,\,\,Et \\
\,\,|\,\,\,\,\,\,\,\,\,| \\
Ph-C-C-Et \\
\,\,|\,\,\,\,\,\,\,\,\,| \\
\,\,\,\,\,OH\,\,OH \\
\end{matrix}}}\,\xrightarrow{{{H}_{2}}S{{O}_{4}}}$

$(p)$ $\begin{matrix}
Ph\,\,\,\,\,O\, \\
|\,\,\,\,\,\,\,\,||\,\, \\
Ph-C-C-C{{H}_{3}} \\
|\,\,\,\,\,\,\,\,\,\,\,\, \\
C{{H}_{3}}\,\,\,\,\,\,\,\, \\
\end{matrix}$ $(q)$ $\begin{matrix}
\,Ph\,\,\,\,\,O\, \\
\,\,|\,\,\,\,\,\,\,\,|| \\
Ph-C-C-Et \\
|\,\,\,\,\,\,\,\,\,\, \\
Et\,\,\,\,\,\,\,\,\,\, \\
\end{matrix}$

$(r)$ $\begin{matrix}
\,Ph\,\,\,\,\,O\, \\
|\,\,\,\,\,\,\,\,\,\,||\, \\
Ph-C-C-C{{H}_{3}} \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
Et\,\,\,\,\,\,\,\,\,\,\,\,\, \\
\end{matrix}$ $(s)$ $\begin{matrix}
\,\,\,Ph\,\,\,\,\,O\, \\
\,\,|\,\,\,\,\,\,\,\,|| \\
Ph-C-C-Et \\
|\,\,\,\,\,\,\,\,\,\, \\
C{{H}_{3}}\,\,\,\, \\
\end{matrix}$

When $(A)$ and $(B)$ reacts with $H_2SO_4$ products obtained are

→

Calculate the current (in $mA$ ) required to deposit $0.195\,g$ of platinum metal in $5.0\,hours$ from a solution of $[PtCl_6]^{2-}$ : (atomic weight : $Pt = 195$ )

→

Which of the following would have the lowest vapor pressure in the pure state?

→

Aldehydes are isomeric with

→

$'A'$ and $'B'$ in the following reactions are ${image}$