| S.No. | Inductive effect | Resonance effect |
| 1. | It involves displacement of σ electrons in saturated compounds. | It involves displacement of $\pi$ electrons or lone pair of electrons in unsaturated and conjugated compounds. |
| 2. | 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. |
| 3. | In inductive effect, there is slight displacement of $\sigma$ electrons and partial +ve or-ve charge develops. | In this effect, there is complete transfer of $\pi$ electrons and as a result, complete +ve or -ve charge develops. |
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Elements
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$\Delta\text{H}_1$
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$\Delta\text{H}_2$
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$\Delta_{\text{eg}}\text{H}$
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i.
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Most reactive non metal
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A.
|
419
|
3051
|
-48
|
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ii.
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Most reactive metal
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B.
|
1681
|
3374
|
-328
|
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iii.
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Least reactive element
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C.
|
738
|
1451
|
-40
|
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iv.
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Metal forming binary halide
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D.
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2372
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5251
|
+8
|