(1) Diborane is a colourless gas with a foul smell and is extremely
toxic.
(2) Melting point = -164.85oc and
Boiling point = -92.59oc
(3) It is an extremely reactive inflammable gas which burns in air with a green flame
.(4) Boranes have great affinity for water and O2 hence they do not occur in nature. Moreover borane cannot be prepared directly from its elements as they have positive enthalpy and positive free energy of formation.
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