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It is now becoming apparent that molecules having π-orbitals have a highly directed force field, although such molecules are usually considered to be non-polar. The π-orbital exhibits a definite 'donor' property relative to acceptor molecules such as hydrogen chloride. In order to investigate the donor nature of π-orbitals in olefinic, acetylenic and aromatic compounds, freezing point diagrams of a series of such compounds with hydrogen chloride were carried out. In these experiments it is assumed that HCL acts as an acceptor 'probe' molecule, and hence the composition of the molecular compounds appearing in the freezing point diagram should give information …
