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Question

Which of the following order is correct if we consider +I power?

Tertiary-alkyl                           secondary-Alkyl                             primary-alkyl

        I                                                II                                                  III



A

I > II > III

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B

I < II < III

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C

II > I > III

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D

III > I > II

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Solution

The correct option is D

III > I > II


We know about +I effect.

The Inductive effect is related to the ability of substituent(s) to either withdraw or donate e density to the attached C attom. Based on this ability, the substituents are classified as ewithdrawing (EWG) or edonating groups (EDG) relative to H.

EWG or e attracting groups are represented by -I and EDG or erepelling groups are represented by +I symbol.

Now,      
 

Here, we can see that there will be a higher negative charge on carbon in case of tertiary alkyl.

Therefore, power of +I effect will be  III > II > I


Chemistry

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