[abhineet]

Which has more inductive effect...
-NH3+, -N(CH3)3+, -COOH, -NO2.
Arrange the above in increasing order and explain why you did it that way, if possible??
If your answer is based on experimental results and cannot be explained theoretically, then please specify that.
Don't know what to do?

[Schrödinger]

Just think in terms of electronegativity which gives a rough idea about the ability of the entire group to pull electrons towards itself from the Carbon that it's linked to.

Also think of factors that can reduce/increase the magnitude of this inductive effect...something like the inductive effect of the other molecules/groups on the central atom.

[abhineet]

Just think in terms of electronegativity which gives a rough idea about the ability of the entire group to pull electrons towards itself from the Carbon that it's linked to.

Also think of factors that can reduce/increase the magnitude of this inductive effect...something like the inductive effect of the other molecules/groups on the central atom.

I tried and am getting the answer for -I effect:
-NH₃⁺ > -N(CH₃)₃⁺ > -NO₂ > -COOH
But in books the order is:
-N(CH₃)₃⁺ > -NH₃⁺ > -NO₂ > -COOH