Consider the following four compounds $I, II, III,$ and $IV$.

Choose the correct statement($s$).

$(A)$ The order of basicity is $II > I > III > IV$ .

$(B)$ The magnitude of $p K_{ b }$ difference between $I$ and $II$ is more than that between $III$ and $IV$.

$(C)$ Resonance effect is more in $III$ than in $IV$.

$(D)$ Steric effect makes compound $IV$ more basic than $III$.

Q: Consider the following four compounds $I, II, III,$ and $IV$. Choose the correct statement($s$). $(A)$ The order of basicity is $II > I > III > IV$ . $(B)$ The magnitude of $p K_{ b }$ difference between $I$ and $II$ is more than that between $III$ and $IV$. $(C)$ Resonance effect is more in $III$ than in $IV$. $(D)$ Steric effect makes compound $IV$ more basic than $III$.

d (image) $pKb$ different between $I$ and $II$ is $0.53$ and that of $III$ and $IV$ is $4.6$. So option $(B)$ is incorrect Correct Statement $(C), (D)$ The most basic compound in the given option is $(II)$ and least basic compound is $(III)$ In $2,4,6$-trinitro aniline $(III)$ due to strong $- R$ effect of $- NO _2$ groups, the $\ell$.p. of $- NH _2$ is more involved with benzene ring hence it has least basic strength. Whereas ($IV$) $N,N$-Dimethyl $2,4,6$-trinitro aniline, due to steric inhibition to resonance (SIR) effect, the lone pair of nitrogen is not in the plane of benzene, hence make it ( $\ell$.p.) more free to protonate (image)

Question

Consider the following four compounds $I, II, III,$ and $IV$.

Choose the correct statement($s$).

$(A)$ The order of basicity is $II > I > III > IV$ .

$(B)$ The magnitude of $p K_{ b }$ difference between $I$ and $II$ is more than that between $III$ and $IV$.

$(C)$ Resonance effect is more in $III$ than in $IV$.

$(D)$ Steric effect makes compound $IV$ more basic than $III$.

A$A,B$
B$A,C$
C$A,D$
D$C,D$

IIT 2020, Difficult

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