Reaction Intermediates
Short lived fragments called reaction intermediates result from homolytic and heterolytic bond fission. The important reaction substances are carbocations, free radicals, carbanions, benzyne, carbenes and nitrenes.
Table :
|
Characteristic
|
Free radical
|
Carbocation
|
Carbanion
|
Carbene
|
|
Nature
|
Neutral having odd electron
|
Positive charge on C
|
Negative charge on C
|
Neutral, divalent with 2 unshared electrons
|
|
Hybridisation
|
sp2
|
sp2
|
sp3 (non-conjugated)
sp2 (Conjugated)
|
(i) sp2 (singlet)
(ii) sp (triplet)
|
|
Structure
|
Planar
|
Planar
|
Pyramidal/Planar
|
(i) Planar (singlet)
(ii) Linear (triplet)
|
|
Magnetism
|
Paramagnetic
|
Diamagnetic
|
Diamagnetic
|
(i) Diamagnetic
(ii) Paramagnetic
|
|
Stability order
|
|
|
|
Triplet > singlet
|
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