MCQ
Correct order of basic strength is:
- A$iii > i > iv > i$
- B$iv > iii > ii > i$
- ✓$iii > ii > i > iv$
- D$iii > i > ii > iv$
$(ii)$ 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
$iii > ii > i > iv$
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$\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||} \\
{C{H_2} = CH - C{H_2} - C - H}
\end{array} \to C{H_3} - C{H_2} - C{H_2} - C{H_2}OH$
$\begin{align}
\begin{matrix}
C{{H}_{3}}-CH-C{{O}_{2}}H \\
|\,\,\,\,\,\,\,\, \\
\underset{\oplus }{\mathop{N}}{{H}_{3}} \\
\end{matrix}\,\,\,\,\,\,p{{K}_{a}}=2.2 \\
\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,p{{K}_{b}}=4.4 \\
\end{align}$