Their is a unique feature of Beryllium nitrate , on heating at low temperature (125℃) it give Basic Beryllium nitrate , nitrogen gas and oxygen gas but at high temperature (above 1000℃) it give same products like other bivalent nitrate salts.
Tuesday, December 22, 2020
Why are the properties of CO2 and SiO2 different?
Their properties are very different because CO2 is a chain-like three-atom molecule and SiO2 is a solid compound with the three dimensional bridges between silicon and oxygen atoms.
Monday, December 21, 2020
Why trimethylamine amine ( N(CH3)3) is tetrahedral while trisilyl amine (N(SiH3)3) planner.?
Nitrogen (N) atom in trimethylamine [N(CH3)3] is sp3 hybridised and tetrahedral due to non bonding electron pair of N is localised (more basic). On the other hand N atom of trisilylamine [N(SiH3)3] is sp2 hybridised and trigonal planner.This is due to the participatlon of non-bondlng pair of N into pπ-dπ back banding. Due to this delocalization of non-bonding electron pair of N in trisilylamine it is also less basic.
What is the Si–N–C bond angle in Silyl isothiocyanate and methyl isothiocyanate (H3CNCS)?
The hybridization of Nitrogen in Methyl isothiocyanate (H3CNCS) is Sp2. Thus bond angle (< C-N-C) is expected to be 120°. But it is slightly greater than 120° due to resonating structure. The resonating structure has N as Sp hybridized. Hence bond angle of the overall structure is found to be about 142°
But in case Silyl isothiocyanate (SiH3NCO), the structure is found to be (sp hybridized)
What are the order of extent back bonding, Lewis acid character and nucleophilicity of (BF3, BCl3, BBr3, BI3)boron trihalides?
(1) Back bonding extent in boron tri halides decreases from
BF3 to BI3 because on increasing of size of
p-orbital of halogens atom the strength of back bond decreases thus extent of back bonding:
(2) Lewis acid character of Boron Halides is inversely proportional to extent of back bonding because on decreasing back bonding tendency to accept lone pair from base is increases thus the order of Lewis acid character is:
Hence it is clear that BF3 is weakest Lewis acid
due to stronger 2pπ-2pπ back bonding (stronger partial double bond character)
in BF3 (lone pair orbital of fluorine into vacant orbital of
boron) and consequently behaves as less electron deficient. The back bonding
gradually decreases (From BF3 to BI3) and becomes
weakest in BI3. So that BI3 become strong Lewis acid
(3) The nucleophilicity(affinity towards nucleophile/water) order is
inversely proportional to the Lewis acid character thus
the nucleophilicity order is:
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?
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:
Subscribe to:
Posts (Atom)