5. "Aluminium fluoride exist as dimers while BF, exist as monomer". Which of the given explanation is
suitable for the above statement?
(a) The smaller boron atom cannot accommodate four large sized fluoride ions
(b) The energy released by the formation of an additional bond to another Boron atom is not sufficient
to compensate for the loss in energy to the system in overcoming the B-F pn - pn back bonding in the
monomer itself
(c) The octet of boron atom is complete
(d) Due to non-availability of electrons in Boron atoms
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Answer:
correct ans is (a )the boron cannot coordinate with four fluoride atoms to form dimer
correct ans A
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