Final answer:
In chemistry, electron donors can be classified into pi donors and sigma donors, while electron acceptors can be divided into pi acceptors and sigma acceptors.
Step-by-step explanation:
In chemistry, electron donors can be classified as pi donors and sigma donors, while electron acceptors can be classified as pi acceptors and sigma acceptors.
A pi donor donates electrons in a pi bond, which is a bond formed by the overlap of orbitals in a side-by-side fashion with the electron density concentrated above and below the plane of the nuclei of the bonding atoms.
A sigma donor donates electrons in a sigma bond, which is a bond formed by the overlap of orbitals in an end-to-end fashion, with the electron density concentrated between the nuclei of the bonding atoms.
A pi acceptor accepts electrons in a pi bond, while a sigma acceptor accepts electrons in a sigma bond.