Question

Which of the following group will show $-I$ effect?

• A. $-C{H}_3$
• B. $-N{F}_3^{+}$
• C. $-C{R}_3$
• D. $-C{H}_2^{-}$

Answer 1

The correct option is B $-N{F}_3^{+}$


The $I$ effect of $-H$ is considered to be zero. According to the figure, if a group is present towards the right side of $-H$ (EDG's) then it will show the $+I$ effect. And groups present towards the left of $-H$ (EWG's) will exhibit $-I$ effect.
Hence option (b) is the correct answer.