Question

Arrange the following groups in the order of decreasing (+I) effect with reference to hydrogen.

• A. $C_6{H}_5{O}^{-}$
• B. $C{R}_3$
• C. $CO{O}^{-}$
• D. $H$
• E. $CH{R}_2$

Answer 1

The correct order :
$C_6{H}_5{O}^{-}>CO{O}^{–}>C{R}_3>CH{R}_2>H$
+I effect theoretically more for that group which directly attaiched atom have least electronegativity.
And then partial charge on directly attaiched atom so $H=2.2$ is least than others has higher +I effect.