+R and - R effect are applicable only of benzene or also for other unsaturated compounds showing resonance?

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The arrangement of ${(C H_{3})}_{3} C -$ , ${(C H_{3})}_{2} C H -$ , $C H_{3} C H_{2} -$ when attached to a benzene or an unsaturated group in increasing order of inductive effect effect is.

Q. Give three points of differences between inductive effect and resonance effect.

S.No	Inductive effect	Resonance effect
1	It involves displacement of a electrons in saturated compounds.	It involves displacement of $%$ electrons or lone pair of electrons in unsaturated and conjugated compounds.
2	In inductive effect, there is slight displacement of $σ$ electrons and partial +ve or-ve charge develops.	In this effect, there is complete transfer of $π$ electrons and as a result, complete +ye or -ye charge develops.
3	Inductive effect can move only upto 3 to 4 carbons.	In this case, movement of electrons all along the length of conjugated system takes place.

Q. The arrangement of

(C H_{3})_{3} C -, (C H_{3})_{2} C H -, C H_{3} C H_{2} -

when attached to benzene or an unsaturated group in increasing order of inductive effect is

Q. The arrangement of

{({C H}_{3})}_{3} C -, {({C H}_{3})}_{2} C H -, {C H}_{3} {C H}_{2} -

when attached to benzene or unsaturated group in increasing order of activating effect is:

Q. Why Peroxide Effect or Kharasch effect is applicable only to addition of HBr???

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