BF3 has a planar trigonal geometry due to sp2 hybridisation of boron in BF3. Boron atom in BF3 is electron defficient (incomplete octet) and fluorine atom is electron rich (due to the presence of three lone pair of electrons on fluorine atom).
Boron and fluorine both belong to the same
period. Hence their bonding orbitals have almost same size and same
energies.Thus Back Bonding takes place between B and
F. This introduces a partial double
bond character between B-F of BF3. Thus B-F bond length decreases from
normal B-F bond length.
In
BF4-,the hybridization
of boron is sp3. The B-F bond has pure single bond character. Thus B-F bond
length in BF4-, is more than the B-F bond length in BF3
.
Why aqueous
solution of AlCl3 is acidic in nature ?
What happen when
aq AlCl3 react with Acid or Base?
Although
anhydrous aluminium chloride is covalent but its aqueous solution is ionic in
nature. Why?
Why BF3 do not
exist as dimer?. Explain.
Why B-F bond
length in BF3 is shorter (130 pm) than B-F bond Iength in BF4- (143 pm)?.
Explain.
B-F bond length
in BF3 is shorter than B-F bond length in (BF4)- why?
What is product
of reaction between diborane (B2H6) and ammmonia (NH3)?
Why methylation
of Diborane (B2H6) replace four hydrogen only ?
What is use of
Orthoboric acids?
What is basicity
of "Boric acid" ?
Why Boric acid
exist in solid state ?
What is
structure of solid Ortho Boric acid ?
What is effect
of heat on Borax?
What is the
structure of trimetaboric acid and trimetaborate ion?
What is the
Sodium per borate ,give the structure and its uses?
Why aqueous
solution of borax reacts with two moles of acids ?
What is the
molecular formula of Borax ?
Why Boric acid
become strong acid in the presence of cis 1,2-diol or 1,3-diol ?
Why Borazine is
more reactive than benzene towards Electrophic Aromatic substitution reactions
?
Why Borazine
(B3N3H6) is also known as inorganic benzene ?.
Four-center
two-electron bond (4C-2e Bond): Structure of AlCl3:
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