Question

Which of the following group will show $+R$ effect?

• A. $-CHO$
• B. $-N{H}_2$
• C. $-N{O}_2$
• D. $-COC{H}_3$

Answer 1

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

$-N{H}_2$ is an electron-donating group among the four groups since it can donate lone pair. Therefore, it will show $+R$ or $+M$ effect.