Some meta-directing substituent's in electrophilic aromatic substitution are given here. Which one is most deactivating?

Question

Some meta-directing substituent's in electrophilic aromatic substitution are given here. Which one is most deactivating? (A) -SO3H (B) -COOH (C) -NO2 (D) -C≡ Ν

Tardigrade Admin · Accepted Answer

Here -NO2 has max -I, -R effect so it is the most deactivating group and deactivating order is as follows -NO2>-SO3H>-CN>-COOH

Q. Some meta-directing substituent's in electrophilic aromatic substitution are given here. Which one is most deactivating?

$- S O_{3} H$

$- COO H$

$- N O_{2}$

$- C \equiv N$

Here $- N O_{2}$ has max -I, -R effect so it is the most deactivating group and deactivating order is as follows
$- N O_{2} > - S O_{3} H > - CN > - COO H$

Q. Some meta-directing substituent's in electrophilic aromatic substitution are given here. Which one is most deactivating?

−SO3​H

−COOH

−NO2​

−C≡N

Here −NO2​ has max -I, -R effect so it is the most deactivating group and deactivating order is as follows −NO2​>−SO3​H>−CN>−COOH

$- S O_{3} H$

$- COO H$

$- N O_{2}$

$- C \equiv N$

Here $- N O_{2}$ has max -I, -R effect so it is the most deactivating group and deactivating order is as follows
$- N O_{2} > - S O_{3} H > - CN > - COO H$