Question

Which of the following group show +M effect ?

• A. $-CN$
• B. $NO$
• C. $-CC{l}_3$
• D. $-CHO$

Answer 1

The correct option is B $NO$

The groups having lone pair of electron to donate and after donation it must have 8 shared pair of electron with $+$ charge on it, can show +M effect;

from the given options, only NO is having lone pair of electron; in rest of the options bond connectivity is through C atom, which is not having lone pair of electron.

so, NO will show +M effect.