Welcome to Chem Zipper.com......: Why B-F bond length in BF3 is shorter (130 pm) than B-F bond Iength in BF4- (143 pm)?. Explain.

Search This Blog

Why B-F bond length in BF3 is shorter (130 pm) than B-F bond Iength in BF4- (143 pm)?. Explain.

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 .

 Related Questions: 

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?

When B2H6 is allowed to react with following Lewis bases, then how may given Lewis base form adduct through symmetrical Cleavage of B2H6.

What is product of reaction between diborane (B2H6) and ammmonia (NH3)?

Why methylation of Diborane (B2H6) replace four hydrogen only ?

What is Use of Boric Acid?

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:

What is the difference between the structure of AlCl3 and diborane?

1 comment:

Featured Post

Structure of “Borazine/Borazole”/inorganic Benzene:

(1)  Borazine is an inorganic compound with the chemical formula   (B 3 N 3 H 6 ). and also called Borazole. It is a heterocyclic compound,...

Top Search Topics