\((ii)\) The \(+ M\) effect of \(- OCH _{3}\) group increases the basic strength of the following compound. \(+ M\) effect of \(- OCH _{3}\) is greater than \(+ I\) effect of \(- CH _{3}\)
\((iii)\) Among the given options, the following compound is the most basic as the \(- NH _{2}\) group does not involve in the resonance.
\((iv)\) Among the given options, the following compound is the least basic as - \(NH _{2}\) group is involved in the resonance.
Thus, the correct order of basic strength is
\(iii > ii > i > iv\)
${image}$
$(1)$ $C{H_3}C{H_2}N{H_2}$ $(2)$ $\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_2}C{H_3}}\\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,}\\
{\,C{H_3}C{H_2}NH\,\,\,\,\,\,\,}
\end{array}$
$(3)$ $\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,C{H_3}}\\
{\,|}\\
{{H_3}C - N - C{H_3}}
\end{array}$ $(4)$ $\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,C{H_3}}\\
{\,|}\\
{Ph - N - H}
\end{array}$
(image) $+ NaNO_2+HCl \rightarrow $ નીપજ