Q18 / 160 · AP EAMCET 2019 (20 Apr Shift 2) · Chemistry
The correct order of reactivity of the following compounds, towards electrophilic substitution reactions is
- AA > B > C > D
- BD > C > B > A
- Correct answerCC > B > A > D
- DB > C > A > D
Solution
Benzene become less reactive in electrophilic substitution reaction when deactivating group is present in it.
$$ \begin{aligned} & (I=\text { inductive effect } \\ & H=\text { hyperconjugation effect } \\ & M=\text { mesomeric effect }) \end{aligned} $$ Electrophilic substitution reaction is $\propto+M,+I,+H$ effect and $$ \propto \frac{1}{-M,-I,-H} $$
Hence, correct order is
$$ \begin{aligned} & (I=\text { inductive effect } \\ & H=\text { hyperconjugation effect } \\ & M=\text { mesomeric effect }) \end{aligned} $$ Electrophilic substitution reaction is $\propto+M,+I,+H$ effect and $$ \propto \frac{1}{-M,-I,-H} $$
Hence, correct order is
Hence, the correct answer is option: 'C'.