Question

Select the correct option for most meta-directing groups.

• A. ${\mathrm{NO}}_2$
  
• B. ${\mathrm{OCH}}_3$
• C. $\mathrm{CHO}$
• D. ${\mathrm{CONH}}_2$

Answer 1

The correct option is A

${\mathrm{NO}}_2$

The explanation for the correct option:

Option A

Meta directing group:

• Meta directing groups are electron-withdrawing groups.
• Meta groups are deactivating groups.
• When the electron density is drawn from the ortho and para positions such that there is an increase in the reaction at the meta position, it is known as the meta-directing effect. This is seen in $-\mathrm{CN}$ and$-{\mathrm{NO}}_2$,etc.

Therefore, option A is correct.

The explanation for incorrect options:

Ortho para directing group:

• Ortho and para directing groups are electron-donating groups.
• These groups increase the electron density in a molecule through carbon atoms it is bonded to by increasing electron density on adjacent carbon atoms and making them electron-rich compounds.
• For example,$-{\mathrm{OCH}}_3,\mathrm{CHO},{\mathrm{CONH}}_2$ etc.

Therefore, options B, C, and D are incorrect.