How many carbon hydrogen bond orbitals are available for overlap with the vacant p-orbital in ethyl carbocation?

Which of the following can have vacant p-orbital?

Which of the following can have vacant p-orbital?

Linear overlap of two atomic p-orbitals leads to a sigma bond .

Linear overlap of two atomic p-orbitals leads to a sigma bond .

Ethylene molecules is formed as a result of sp^(2) hybridisation of carbon. Each carbon atom is excited state undergo sp^(2) hybridisation giving rise to three hybrid orbitals each. These hybrid orbtals lie in the xy plane while the fourth unhybridised orbital lies at right angles to the hybridised orbitals. in the overlap ethylene two hybrid orbitals, i.e., one from each carbon atom from a sigma bond by head on overlap while the remaining overlap with hydrogen atoms. the unhybridised p-orbitals undergo sidewise overlap to from a pi -bonds Ground state of carbon atom Excited state of carbon atom The molecules of ethylene is planar If molecular axis is z axis then

Does hydrogen bonding involved the overlapping in atomic orbital ?

p_(y) -orbital can not form pi -bond by lateral overlap with :