Allen test series - This time syllabus for chemistry mentions Reaction Intermediate ( but I have not read this chapter or topic )

This time syllabus for chemistry mentions Reaction Intermediate ( but I have not read this chapter or topic ) . Anyone please elaborate about this topic

I think it's carbocation, carboanion , carbene etc.

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Carbocation, Carbanion, Free Radicle, Nitrene, Benzyne, Carbene.

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Thanks , Guys.

Even i have enrolled for allen test series