Crown ethers and cryptands form:

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(A) Crown ethers and cryptands are macrocyclic and macrobicyclic polyethers,respectively.They possess a central cavity that can accommodate metal cati

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complexes with alkali metals

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(A) Crown ethers and cryptands are macrocyclic and macrobicyclic polyethers,respectively.They possess a central cavity that can accommodate metal cations of specific sizes.Due to the presence of lone pairs on the oxygen atoms,they act as ligands and form stable complexes with alkali metal cations $(M^+)$ through ion-dipole interactions.These complexes are often referred to as host-guest complexes.

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