In which delocalisation of positive charge is possible

In which of the following carbocations, delocalisation of positive charge is possible :

In which of the following carbocations, delocalisation of positive charge is possible :

In which cases delocalisation of charge is possible ?

In which cases delocalisation of charge is possible ?

Assertion: Pyrrolidince (II) is more basic than pyrrole (I) Reason: Protonated pyrrole has delocalisation of positive charge in aromatic ring.

In which of the following , delocalisation of pi- electrons is/are possible?

Resonance is delocalisation of :

Resonance is delocalisation of :