Question

Which of the following groups exerts significant +M effect as well as -I effect?

• A. $\stackrel{\oplus }{-S}(C{H}_3{)}_2$group
• B. $\stackrel{\oplus }{-N}(C{H}_3{)}_3$group
• C. -ONO group
• D. $-N{O}_2$ group

Answer 1

Answer: (C)

-ONO group

-ONO group exerts significant +M effect as well as -I effect.
Thus, it increases electron density by mesomeric effect and decreases electron density by inductive effect.