What are p-pi - p-pi , p-pi - d-pi and d-pi - d-pi bonds??

If there is bonding between two atoms where one atom is having one vacant orbital and another is having one lone pair of electrons, then if this electron pair is donated to that respective vacant orbital then the bonding is called p(pie) - p(pie) or p(pie) - d(pie) depending on the orbital to which the electron pair is donated and from which the electron pair is donated. If both the orbitals are d orbitals, then bonding is called d(pie) - d(pie) bonding.

These types of bonding are known as back- bonding also.

For example,in molecule BF3, B has an incomplete octet so a fully filled p(pie) orbital of F donates a lone pair of electrons to vacant p(pie) orbital of B. So here p(pie) - p(pie) bonding occurs and it is known as back bonding also.

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