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This confusion has put me in problem several times since last 2 years and I have been looking for a clarification but it seems that answer depends upon who you ask. I have several examples where I have searched and infact I changed my chemistry teacher to get this one right but again I am not sure which teacher is correct. We have two orders of Inductive effect from my two different teachers and backed by several websites but I don't know which one is correct.

Let's see the orders

For -I

From Teacher A

-I inductive effect order

I am typing -I inductive effect from teacher A here for indexation as stated in comments

$$\ce{NF3+} >\ce{NR3+} >\ce{NH3+} >\ce{SR2+} >\ce{NO2} >\ce{CN} >\\ >\ce{SO3H} >\ce{CHO} >\ce{CO} >\ce{COOH} >\ce{COCl} >\ce{COOR} >\\ >\ce{CONH2} >\ce{F} >\ce{Cl} >\ce{Br} >\ce{I} >\ce{OH} >\ce{OR}$$

From Teacher B -I inductive effect order

I am typing -I inductive effect from teacher B here for indexation as stated in comments

$$\ce{NR3+} > \ce{NF3+} > \ce{SR2+} > \ce{NH3+} > \ce{NO2} >\\ >\ce{SO2R} >\ce{CN} > \ce{SO2Ar} >\ce{COOH} >\ce{F} >\ce{Cl} >\\ >\ce{Br} >\ce{I} >\ce{OAr} >\ce{COOR} >\ce{OR} >\ce{COR} >\\ >\ce{SH} >\ce{SR} >\ce{OH} >\ce{CCR} (\mathrm{alkyne}) >\ce{Ar} >\ce{CHCR2} (\mathrm{alkene})$$ Where Ar = Aromatic

There are several websites which have different orders too

Please refer -I effect order on following websites and see how they are different from each other

https://www.vedantu.com/iit-jee/inductive-effect

https://en.m.wikipedia.org/wiki/Inductive_effect

https://www.quora.com/What-is-the-order-of-I-and-I-effect

Notice how some keep $ \ce{COOH} $ ahead of $\ce{CO}$ and vice versa, also notice that how some keep $ \ce{NR3+} $ahead of $\ce{NF3+}$ and vice versa although I know for this one that$\ce{ NR3+ }$has more -I effect. Please correct me if I am wrong.

And trust me, I have been trying for an answer for very long time but I didn't found an answer which is from an authentic source. Please consider my desperation for the answer before downvoting as I am going to appear for IIT JEE exam within few months. Thankyou to anyone who tries to answer this question.

Poutnik
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