Question

The strongest ortho-para and strongest meta-direct groups respectively are :

• A. $-N{O}_2$ and $-N{H}_2$
• B. $-N{H}_2$ and $-N{O}_2$
• C. $-N{H}_2$ and $-CON{H}_2$
• D. $-X$ and $-CON{H}_2$

Answer 1

The correct option is B $-N{H}_2$ and $-N{O}_2$

$-N{H}_2$ is one of the strongest and has powerful ortho/para directing effect due to the electron-donating ability of $-N{H}_2$ higher than others.

$-N{O}_2$ is one of the strongest deactivators and has powerful meta directing influence because it has the greatest electron-withdrawing ability of $-N{O}_2$ group higher than others.

Hence, option B is correct.